Sorry Logitech mice suck now, ever since they revamped the actual physical mouse design.
New Logitech mice are made for small hands. As a normal size guy, i bought one and its horrible. The mice are very long, not wide. Thus your palm doesn't fit on it well, very uncomfortable. For someone with small hands it might work, but normal hands its entirely uncomfortable.
Also, Logitech craft their mice with a new "one piece" case, the buttons aren't really buttons anymore, just "floating" pieces of the mouse casing. So when you click your button you are really just pushing down on a floating piece of the casing. Very sucky. Plus doesn't mesh well with the circuitry underneath.
I was vastly disappointed with my newer logitech mice i tried out, badly designed for larger hands, plus incredibly bad buttons. Often doubleclicking would do nothing unless you mashed down hard on the floating "buttons".
I switched to a cordless optical microsoft mouse. Its not perfect but it does the job and is much much more comfortable than the Logitech mice. Buttons work great, fitted for your palm very good. Not great tracking, but i did only get the basic one.
You can try the logitech, but if you just look at them you can see they are ver slim, and tall. Your palm isn't. The microsoft mouse fits EXACTLY into your palm and requires no stretching of fingers to push buttons or relax.
