First of all sorry for my late posting in this thread. I was just surprised when I see so much hate on the G500.
Anyways here's my experience:
I bought the G500 April this year and then 2 months later the DA black edition. I use my mouse mostly on a Steelseries Qck+ cloth pad but sometimes on my desk as well and both mice works perfectly fine on both surfaces.
I actually preferred the G500 instead of the DA black edition because I didn't really like the feeling of the coating of DA black edition and my hands somehow get sweaty faster when I'm using the DA black edition, G500's shape seems to fit my hand better and I like the weird "sandpaper like" coating on the G500, it also has the awesome scroll wheel which I really like for some reason.
I read from the wiki page here
and it says:"The Logitech G500 mouse uses the same laser sensor found in some other high-end logitech mice. Many have noted that the sensor is prone to "hiccups" at high dpi settings, "pixel crawl" effects, and acceleration issues. All of these issues have been fixed with sensor firmware updates, the most recent being version 58.18."
I checked mine and mine is the 58.18 version the day I bought it. Could it be that those of you who have problems weren't using the latest version?