I have had the mx700 for almost 20 months. Its a great mouse for gaming to anything web based and anything else. I like the side buttons for games and for forward and back while web browsing. I am thinking of getting a mx1000, its laser instead of optical. I have tried it out and it is the best mouse I have tried. If you dont want to spend 70$ on the mx1000, I would suggest the mx700 as the next best mouse out there. I dont have any complaints on the mx700. It runs on nimh AA batteries. I often use regular AA batteries that my cd has used up. I tend to get four more days out of them before they die.
I would say go for it. Logitech makes great products, which ever one you decide on.