I bought the M8000X 'Ghost' mouse, had troubles with mine.
Now and again it would drop the connection and the cursor would freeze, and had to unplug and then plug it back in to get it to work again.
I had one of the buttons programmed for the 'laser' to correct its aim.........I forget the actual terminology, but that didn't work to cure it.
There were other niggles with it too, with the 'close' button not working on my left hand second monitor, to shut down Windows Live Mail for example.
I had the latest drivers on offer, and uninstalled and reinstalled the mouse, but still now and again got the problem, which is kind of annoying when playing a game online..
Now, the mouse looks good, and fitted my hand just fine, but the annoyance factor eventually made me dump the mouse for the Logitech G500.
Now, I like Gigabyte products, and since Abit went bust I always buy their motherboards. For graphics cards I used to buy BFG, but now I choose Gigabyte.
I thought their mouse would be a good addition.
Shame really, for quite an expensive (to me) mouse to be irritating.