The Corsair M65 RGB Ultra Wireless is a mouse of two tales. While the internals and everything related to performance are mostly competent, everything else falls short.

Much like the Sabre RGB Pro Wireless, the M65 RGB Ultra Wireless does well in terms of sensor and wireless performance. CPI deviation is appreciably low, polling stable across the board, and the isolated wireless delay sits at around 1.5 ms, which is respectable, especially when taking the lack of a wireless extender into account. At the same time, plugging a wireless dongle directly into a USB 3.x port is known to potentially introduce interference adversely affecting wireless operation, which is why I'd like to have seen an extender included nonetheless. Even mice in the $80 price range tend to have an extender included these days, so expecting the same from a $129.99 mouse surely isn't out of line. Curiously, the wireless delay is slightly worse on the M65 RGB Ultra Wireless than on the Sabre RGB Pro Wireless, which managed to do just 1 ms. As general tracking is worse as well, I suspect all the functionality of the M65 RGB Ultra Wireless is taking its toll on the MCU. When it comes to click latency, the M65 RGB Ultra Wireless does quite well. Without debouncing, click latency is just 2.2 ms in wireless operation, but slam-clicking can happen, which disappears upon enabling debouncing, which has click latency increase to a still good 6.1 ms.

On my initial launch sample, button quality was simply disastrous. Originally, the M65 RGB Pro Wireless shipped with Omron D2FP-FN optical switches. Unfortunately, the left main button in particular was poor to where it may as well be described as defective, and the right one was far from stellar, too. Thankfully, Corsair has since made the switch to optical switches from TTC, using the same model already familiar from recent ROCCAT releases. While the TTC switches aren't as snappy as the Omron ones, they are more uniform and consistent, though neither switch feels particularly good on the M65 RGB Ultra Wireless. The same goes for the side buttons. On my launch sample, the side buttons were particularly poor, with the back button being the greater offender, suffering from massive pre and post-travel, which resulted in mushy and uneven actuation. This has also been improved since, and while the side buttons still aren't particularly good on my second sample, pre and post-travel on the back button is more under control now. The scroll wheel fares better by comparison: While noise levels are elevated, tactility is quite good, allowing for controlled scrolling. Lastly, the feet are quite decent, but nothing more.

As far as I'm concerned, the integrated weight system is of limited usefulness as the M65 RGB Ultra Wireless already is quite heavy to begin with. On a mouse that starts at a low weight, a weight system can make sense, but making an already heavy mouse even heavier serves little purpose. At least the option is there for those who want their mouse to be as heavy as possible. Speaking of pointless, the same can be said about the tilt gesture system. I challenge anyone to show me how awkwardly lifting the mouse during play for reloading, which could simply and most conveniently be done through a keyboard bind instead, adds any sort of value. If anything, doing so slows me down and stops me right in my tracks, and the same is true for other actions such as crouching, among others. Even for productivity work there are far more efficient ways to execute actions than lifting and tilting one's mouse. Frankly, this feature is utterly useless and a complete waste of development time. At least the additionally available lift-off distance levels are nice to have.

When it comes to the wireless experience, the M65 RGB Ultra Wireless performs very similarly to the Sabre RGB Pro Wireless. Bluetooth once again is on board, the battery capacity has increased greatly, resulting in longer battery life, and charging is a bit faster. The charging cable, however, is still stiff to where playing while charging is hampered greatly. Furthermore, the battery indicator within iCUE still gives no more indication than ultimately non-specific descriptions such as "High." Speaking of iCUE, the experience is the same as ever: Mostly bug-free, but incredibly resource-heavy. Between headset drivers running despite me not owning a Corsair headset, countless driver packages for non-present devices, and incessant logging of system components, iCUE gives me more reasons for prompt uninstalling than I have fingers on my hands. Furthermore, the fact that the hardware profile can only be modified if the mouse is plugged in is particularly puzzling on a wireless mouse. Lastly, and much like on the Sabre RGB Pro Wireless, the advertised 2000 Hz polling rate is not real. The mouse simply sends two identical updates in a single packet, which helps fake readings, but provides no real-life benefit whatsoever.

To sum it up, the Corsair M65 RGB Ultra simply is not a good mouse. Even on the updated batches, the buttons are mediocre at best, the lack of a wireless extender is not acceptable on a $130 mouse, iCUE is a nuisance, and in terms of features and functionality, the M65 RGB Ultra Wireless doesn't do enough to warrant its price tag.