Released roughly a year ago, the Model O 2 Pro 4K/8KHz Edition and Model D 2 Pro 4K/8KHz Edition proved that Glorious still had the ability to deliver top-tier mice. The Series 2 Pro Wireless picks right up where the other two left off, wrapping the same internals into a different package, namely the shape of the Razer Viper Mini. To this day, a genuine Viper Mini Wireless from Razer remains but a wish, as the Viper Mini Signature Edition is beyond most people's budget limits, and the Cobra Pro misses the mark when it comes to weight. At 55 g, the Series 2 Pro Wireless does not, and compares favorably to similarly sized and likewise hole-free mice such as the Endgame Gear OP1we at 58 g. Build quality is in a good spot on my sample: a faint rattle only becomes apparent when violently shaking the mouse, there is no creaking or flexing of the shell when applying lateral pressure, and activating the side buttons by pressing below them is impossible irrespective of how much force is applied.

As far as buttons go, the Series 2 Pro Wireless too falls largely in line with the Model D/O 2 Pro 4K/8KHz Edition. The main buttons are optical switches from RAESHA, which are familiar from several releases from Pulsar and LAMZU, among others. These provide fairly firm and snappy actuation, but will feel duller and more muted compared to most mechanical switches, especially given that pre and post-travel are moderate. In addition, lateral button movement is moderate, though I didn't notice anything of it during actual use, only when actively provoking movement. Since the Series 2 Pro Wireless is a decent bit smaller than the Model D/O 2 Pro 4K/8KHz Edition, instead of full-size mechanical switches from Huano, surface-mounted switches (beige plunger) also from Huano see use. While their pre and post-travel is low, and the actuation point even, button response isn't particularly pleasing, no doubt due to the smaller switch size, which somewhat limits how good they can feel. For the scroll wheel, Glorious once again has opted for the yellow/green core encoder from F-Switch, which is known for its low noise levels, all while delivering decent tactility. The feet are unchanged from the Model D/O 2 Pro 4K/8KHz Edition, made of pure PTFE, and provide very good glide.

Much like the Model D/O 2 Pro 4K/8KHz Edition, the Series 2 Pro Wireless pairs PixArt's PAW3395 sensor with two MCUs: a Nordic nRF52840 for wireless communication along with a USB high-speed MCU from WCH are found on the mouse PCB, with a similar setup found in the wireless dongle. Accordingly, the Series 2 Pro Wireless is able to deliver true 8000 Hz in both wired and wireless operation. By and large, performance is on the same level as on the Model D/O 2 Pro 4K/8KHz Edition, with a few exceptions. CPI deviation hasn't changed at all over the Model D/O 2 Pro 4K/8KHz Edition, and remains a bit larger than I'd want it to be, especially given that adjusting CPI is unreasonably laborious, which we'll get to later. General tracking is fine regardless of MotionSync being enabled or not, and since there is no smoothing, the entire CPI range may be used without any motion delay penalty. In wired mode, polling is stable throughout, whereas in wireless mode, elevated noise can be observed here and there, yet no off-period polls, which is good. Motion delay itself is also on a good level: without MotionSync, the Series 2 Pro Wireless already achieves parity with the Logitech G403 (control subject) at 1000 Hz, and gets ahead of it by 1.0 ms at polling rates above 1000 Hz in wired operation, and by 0.8 ms in wireless operation at polling rates above 1000 Hz. MotionSync adds delay of varying degrees, depending on the set polling rate, and if used in conjunction with 8000 Hz, the target interval of 0.125 ms will not be met, which would be the case without MotionSync. The only area where the Series 2 Pro Wireless falls a bit short compared to the Model D/O 2 Pro 4K/8KHz Edition on the then-current firmware is click latency. In terms of average, only wired click latency is different to any meaningful degree, as instead of 0.4 ms, 0.6 ms are now averaged on the lowest debounce time setting of 0 ms, whereas wireless remains at 0.8 ms at polling rates above 1000 Hz when using a debounce time of 0 ms. Rather, the most relevant difference lies in the now much higher standard deviation, which has tripled or even quadrupled over the Model D/O 2 Pro 4K/8KHz Edition. One of the main advantages provided by USB high-speed mice not only is the lower average, but rather the gain in consistency due to much lower variance. On the Series 2 Pro Wireless, however, standard deviation is similar to regular USB full-speed mice, which should not be the case, and wasn't the case on older firmware. Hence, I'm inclined to file this under a bug, which hopefully will be fixed in the near future. This aside, click latency is still in a very good place, and due to optical switches being used along with slam-click prevention being present, there are no drawbacks to running the lowest debounce time of 0 ms, which is what the Series 2 Pro Wireless is set to by default.

While the software for the Series 2 Pro Wireless is still Glorious Core, it has received a large overhaul with version 2.0, mostly on the visual and functional level. If anything, this overhaul is at least a step back, however, as not only did resource usage increase again, the UI has also turned to the worse. The biggest offender in this regard is undoubtedly CPI adjustment. Whenever a step is set, Core no longer permits changing it. Instead, one has to delete the step and add a new, modified one, and since new steps are always added sequentially, and aren't ordered automatically, or could be ordered manually, one also has to delete all other steps potentially following the one in need of adjustment. Furthermore, the colors the steps are coded with cannot be modified either. In short, CPI adjustment is realized in the most backward way possible, and this is doubly annoying given that all of this was possible before the 2.0 overhaul. In general, navigating Core hasn't gotten any easier with the overhaul, and coupled with increased installation size and resource usage, the fact that cloud profile storage now asks for a Glorious ID barely registers as a minor annoyance. Despite this major overhaul, it also is disappointing to see that Glorious still hasn't been able to fix the lift-off distance setting, whereby it typically defaults to 2 mm, even if set to 1 mm. Hopefully, Glorious will get around to fixing this long-standing issue eventually.

Much like before, Core also includes a battery life indicator, which is percentage-based and features seemingly single-digit accuracy. In practice, however, the indicator did not budge at all for me, even when using the most draining setting (8000 Hz) for several hours. Hence, the only number we can go by is the one cited by Glorious, which is 80 hours at 1000 Hz. Given the battery capacity of 380 mAh, I consider this a reasonable estimate, which would translate to 10–15 hours at 8000 Hz. Charging isn't exactly speedy on the Series 2 Pro Wireless at a little less than 0.2 A, though the very flexible charging cable alleviates this a great deal, as the cable is good enough to allow playing while charging without feeling hindered, and wired use in general is pleasing.

Since the release of the Model D/O 2 Pro 4K/8KHz Edition, several releases offering combined wired and wireless polling of more than 1000 Hz have come out, some of which deliver at least equal performance, even for less than the $129.99 the Series 2 Pro Wireless retails, which is why the feature set of the Series 2 Pro Wireless is less unique than it was a year ago. Accordingly, the main draw of the Series 2 Pro Wireless lies in its proposition of being a still somewhat reasonably priced Viper Mini Wireless, which continues to be a sought after item, Razer's uber-expensive Viper Mini Signature Edition notwithstanding. Despite the mentioned issues, for those in the market for a wireless Viper Mini with very good performance, build quality, and a low weight, the Series 2 Pro Wireless does fit the bill, and gets our Recommended award.