For the price this is quite an impressive mouse, the main things (responsiveness, precision, etc.) are all taken care of. It just feels great to use.
The two main buttons feel amazing, the two side buttons and the wheel not so much. The wheel is just a little too spongy for my taste (and can't scroll horizontally either of course) and the side buttons just feel cheap compared to the rest of the mouse.
I haven't tried the non-minus version but I can say that this one is very small and very light. I don't have big hands so it is great to use, especially to reach the two buttons with my thumb. But since it is not high at all, my pinky will rub on my matt all the time (it also means you don't need a wrist rest). As a final note, I would have liked some metal on it so it feels more sturdy, just like their keyboards. I also would have like to be able to add more weight if I wanted to.