+ Scan properly (in Mouse) + Weight down (since only 1 battery required) + Size (smaller than "normal" mouse, perfect for on the road) + USB Nano Receiver (tiny and can be stowed in mouse during transport) + Battery life + On / off switch + Left and right grip material + Reception has been disturbed by anything with me
- Middle mouse button (click scroll wheel) used to, as the scroll wheel can also be pressed for navigation (forward / back) to the left and to the right. Thus, the key must be pressed quite accurately and quite strong.
CONCLUSION: Despite the small lack there of me a clear buy recommendation!