I have to say it is a pretty decent upgrade from the MX518.
The MX518 was very good imo, it had great intuitive DPI and overall I couldn't play without it.
The g500 has the same grip type and even has additonal buttons. (not too many)
I also like the very rough coating for it, making me have more grip. The design is pretty sweet too.
You can also 'unlock' the scroll wheel, making it loose and thus allowing you to scroll very fast. The scroll wheel can even go left and right, so you can scroll left and right, never seen that on a mouse.
Thinking of going the Logitech way again. Using this old, crappy mouse atm, but I really miss my old G5!
I loved the texture on it, but I guess the opinions on that differ. G500 looks like it's the G5's successor, which grants it immunity in my book.
Yeah, I love my G5. The feet wore out though so it was becoming difficult to use. Just found a place that sells replacements and ordered them yesterday though. My girlfriend wanted on cause she loves mine too, she ended up with a 500.