Today I bought Logitech m705 for $398. Before that I check Logitech m560 and m545, but their size is bit small for my hand. So finally I pick m705 because of size.
When I use m705, I feel the weight is bit heavy for me, I think I have to adapt it for short period of time.
There are two "visible" buttons between thumb and index finger. And there is button on thumb area (a silver line). I think it is useful to switch app, back page and more.
It can scroll VERY smoothly so you can scroll from top of page to end of page quickly. If you think this scroll is "out of control", this is toggle button next to scroll roll to become "click to clic" (traditional scroll)
Right hand only. Sorry guys with dominant left hand. I think the design is quite fit. But note that some people may not like it because it has weight, I mentioned above.
Logitech provide software to customize button usage. Simple and useful.
Day 1!! So can't sure battery life can last for ~3 years (Logitech said).
I think it would be better if there are few dpi. It seems that for now only 1000 dpi is available
I think the design is good for general use. If for gaming, I think it is too heavy to move the mouse