So after everyone around me updated their gaming rigs to uber multicard video goodness, I decided it was high time to fuel my mouse fetish. I've been using hi-end mice for a long time. This time I may have bit too hard on the marketing hook, though.
The G7 is wireless, has a laser for realy high "DPI", and has two swappable LIon batteries. It has two less buttons than my Mx500, but adds the side rocker for the mouse wheel. I think that'll be ok, but I need to reconfigure every game I own now, because I relied quite heavily on the tiny button in front of the mouse wheel on my 500 ( which was the same on my previous cordless mx700).
The G7 app works fine, so far, though I haven't quite figured out how to do custom profiles yet. In order to keep my button quota up, I've switched the sensitivity on the fly buttons to be keystrokes. That means I'm losing one of the advantages of the G7, on the fly DPI changes, unless I can figure out a way to map that to something else on the keyboard.
The G7 is lighter than my mx700, which is good. One of the reasons I went back to the mx500 was because the mx700 was clunky. As is the mx700 base/charger. The G7, while not having one of Logitechs fancy new micro dongles, does have a separate dongle. You can plug the dongle into the charging station or into any other usb port. I personally keep the dongle on the back of my G15 keyboard.
Function wise, I can't really see a difference, but as I said, I'm not changing the DPI on the fly. However, wireless is always better, especially with the cramped desk I keep. I did get my G7 on sale, which made it the same price as its wired counterpart.