The only flaws I found him is that when you take it well in hand, on the 3 side buttons, there is one that I find most difficult to access. No one who is isolated, cut to the tip of the thumb, but one of the other two just above, one that is closer to us (called G4). When the hand well covers the mouse button I find this difficult to access, one inch lateral folding is not enough for me, I have to roll it toward me in supporting it.
As for the positives, more or less everything I would say. The thumb rests is excellent, similar grip on G500, it is still well designed, attractive price, reliability must be seen in the long term but the returns are often very good.