Some people complain here about the reaction time of the mouse - and I can not complain really. When the mouse was in standby, it takes more than 1 second to jump to, and then but works smoothly. For years I was against wireless mice because I bad experiences with a "immigrating" cursor. But the M705 operates exactly like a wired mouse.
Against the processing is nothing wrong. The mouse works like the first day.
Personally, I think the thumb button for redundant, but that does nothing to the point. The free-running scroll wheel is worth gold in long documents.
I own 2 marathon mice, my friend has a, and it has also brought immediately after with a good friend. There are no complaints.