Maybe I can share some of my findings
The thick PBT keycaps aren't as thick as you would imagine. The alphas and numerics are your regular thin Cherry caps, only the 2+ unit keycaps are thick.
The switches feel nice. I would describe them as more bouncy than regular Cherry MX Browns. However, I can't say for sure if that's because the spring has gotten more elastic over time, or if it is because it is PCB mount and the Cherry PCB is fairly thin, and I'm actually just pushing the PCB down, and it's assisting in pushing things back up.
The trackball is pretty cool, though you may need to adjust its sensitivity. I wish it could be larger.
Overall, I like how the keyboard case is put together with screws instead of clips, it makes it feel more secure. I did notice that none of the switches have diodes in them, so this keyboard is probably 2KRO at most.