Build Quality

Overall build quality is solid. When shaking the mouse, there is a slight rattle apparently coming from the side buttons. When applying lateral pressure, a fair amount of creaking but no flexing of the shell can be observed. Activating the side buttons by squeezing the sides is impossible. Lastly, no accidental clicks occur when slamming down the mouse.

Buttons

Main buttons on the DeathAdder V2 X Hyperspeed are very good. Pre-travel is low, but post-travel moderate to high, resulting in a firm and fairly snappy button response nonetheless. Button stiffness is medium. Though described as second-generation Razer mechanical switches, these are in fact modified Kailh GM 4.0 (60 M).


Side buttons are very good. The back button in particular has a fair amount of pre-travel, but post-travel is low on both, and click feel rather pleasing. The pressure point is mostly even across the entirety of these. Button placement is great as actuation is possible very easily by rolling one's thumb across. A set of CF switches (white plunger) is used.

Next to the left main button are two buttons for cycling up and down through the set CPI steps, which work just fine. Two seemingly unbranded tactile switches are used here. A slider at the bottom switches between 2.4 GHz, Bluetooth, and off-state, which too works fine.

Scroll Wheel

The scroll wheel is good. Scrolling upwards in particular is noisy, but tactility is quite good, with well-defined steps and rather light scrolling. The encoder comes from TTC (white core) and has a height of 14 mm. The middle (scroll wheel) click requires high force for actuation. A seemingly unbranded high-profile tactile switch is used for this one.

Coating

The DeathAdder V2 X Hyperspeed has a slightly rougher matte surface all over, which provides great grip. It doesn't attract fingerprints, dirt, or the likes too much, is easy to clean, and there are no signs of wear left after doing so. All in all, excellent materials.

Whereas the top cover of the regular DeathAdder V2 X Hyperspeed is made out of ABS, a polycarbonate is used for custom top covers available through Razer, which also have a smoother texture.

Button Sound Test

Disassembly

Unlike on the Orochi V2, disassembling the DeathAdder V2 X Hyperspeed does require removing the mouse feet, but is fairly easy nonetheless. First, remove the top and bottom skates and the three Torx T6 screws beneath them. In addition to that, there are two clips in total holding the top shell in place, which also need to be dislodged.

The internal design is remarkably efficient. The battery holder is screwed into the top shell and connected through a 2-pin connector to the main PCB. The notably compact and thin main PCB holds everything else except for the left main button and the CPI button, which sit on their own PCB directly slotted into a connector. While the side buttons are mounted vertically atop a plastic assembly, the MCU is rear-mounted. Three screws are used to directly affix the main PCB, and two additional screws fixate the side buttons. The MCU is a Nordic nRF52840, whose datasheet can be found here. Production date for the main-button PCB is the 37th week of 2021.


As for the soldering and general quality of the PCB, I'm unable to find any noteworthy flaws.