Heh. After looking at their webpages, I'd add something else: fully
open interface. Depending on vendor-provided "drivers" (especially
when they're available for only OSes I don't run) will kill it for me
no matter how good it may be in other respects.
/~\ The ASCII der Mouse
\ / Ribbon Campaign
X Against HTML mouse(a)rodents.montreal.qc.ca
/ \ Email! 7D C8 61 52 5D E7 2D 39 4E F1 31 3E E8 B3 27 4B