I needed a new mouse anyway. My sooper dooper Gearbest $5 gamer incl of all delivery charges with lots of buttons mostly just for show LOL died. I think flattening it with pressure shots in the VUSO finally did it:)
A spare v reasonable gaming mouse around this place was never going amiss, sons have a gaming machine and play other stuff. I took advice from the gentleman above and bought it.
The G300S works fine and as advertised. Personally, those buttons on top have not got in my way and you can indeed have them unassigned. The best actual shape is always personal of course.
Anyone who says (as earlier) you can't see scroll rate (DPI) differences most certainly never installed any SW. Like walking fast v slow difference - real basics. Pollings rates have already been discussed............