Been playing around with mine a bit.
Ordered
this screw kit. Used the M2.5x3mm for the M.2 screw and the M2.5s for the case. As a bonus, these are Phillips rather than Torx, so I'm more likely to have the correct bit on hand. I ended up placing the included rubber pads on the cover, but not in the indentations where you're supposed to put them, since that would cover the screws. I get the feeling this device is meant as more of a "make your own external drive" rather than as a dock where you frequently swap drives.
Can't format NVMe drives to a different block size when using USB, but it will respect and correctly report 512 vs 4k if the drive is already formatted as such.
The cover doesn't seem to want to sit completely flat if the drive has some thicker components like capacitors.
Overall very worth the $20. I was looking for a M.2 dock that isn't cheap flaky crap and this definitely works. All my drives are 2280 so the size is perfect.