- The ball looks rickety and somehow cheap.
- The accessibility of Naviagationstasten is getting used to - I have to with his forefinger already feel exactly which button I just.
- Super mouse replacement without hand movement on any surface (bed, thighs, beanbag)
- Logitech Unifying technology (a receiver, several devices)
Accessibility I have not been extensively tested - 3-4 meters but go easily.
Would have like only half a star deducted, but not the point. Therefore, 4 stars for the ratio cheap plastic feel for the price.