As is usually the case w/ Logitech mice, the cord works fine and doesn't affect mouse operation.
I wouldn't mind having a cordless but I read they simply aren't as good for gaming and are heavy, and I haven't had any complaints w/ MouseMan corded mice so why change now? I'm not a longtime Logitech user (as they've been around 15 years or more) but I have now used about 5 generations of Logitech mice with no regrets. They never fail; they just get too dirty & are replaced.
Currently using the MouseMan DO. The only "issue" I experienced was the tracking in Counter Strike "felt" different from the tracking I had gotten w/ the first-gen (blue) Optical MouseMan. Not necessarily better or worse, but different. I think I'd get better results if I installed Logitech's drivers, but for now I'm sticking w/ WXP built-in drivers and have already gotten accustomed to the different tracking in C-S, for better or worse.