I bought the MX 700 about a week ago, and here are my comments:
Nice feel, and size though a bit heavy compared to regular corded mice. I'm moving from an Intellemouse Explorer Version 1.0, so I was used to a huge mofo of a mouse.
The buttons near the scroll wheel seem really useless to me, I don't see why I woulud use the button to scroll instead of the mousewheel. The alt-tab button seems kinda useless too, but maybe because I use 'focus follows mouse' anyway.
Because I didn't need the features of the alt-tab button, I just use the default windows software for the mouse and not the logitech ones. With the logitech one, you have to enable MS compatible scroll and scroll in active window for it to work in games. However, even with the default microsoft drivers, the scroll wheel still won't scroll in all windows.
The left and right buttons are sufficent and give good feedback. The back and foward buttons could have been a bit bigger like the Intellemouse, but maybe I'm just used to the size of that mouse's buttons.
As for the wireless part...
The claim that it is as good as a corded mouse is mostly true. It feels no different than the old intellemouse 1.0 that I had. The response feels the same in games, and I don't notice any delays or wierd tracking. The mouse does not go to sleep after leaving it alone for a short time. However, I think it does shut down after about 5 or 10 minutes of leaving it alone. I'm not quite sure how long, but I know it's a really long time. The charging base is a VERY nice touch. The charging base and fast wireless transmission were the main reasons why I bought this over the MX 500.
The mouse can be moved very very fast compared to my 1.0 intellemouse before it skips. In fact, I really haven't gotten it to skip when using it unless I was purposly trying to throw it across the table. The intellemouse would skip when you even went semifast (remember, it was v1.0).
Goods:
Wireless that is very responsive
Charging base
Back and foward buttons
Nice feel/shape
Doesn't go to sleep anytime soon
Bads:
Alittle heavy
semi-useless scroll butons/alt-tab button
bad software (compatability with scrolling)
PM me if you have questions.