If Roccat ever decides on a Kain ambi with the profile of the right half of the mouse, I'm on board. I think that size would be impeccable.
The left side sits too high in a position I'm not comfortable with, and nowhere for my 1-3-1 to sit my ring finger comfortably either. Maybe with more time, but I already find myself not so reactive due to uncertainty with the grip. The G403 is just as high, so is the DA, but I could grip those more confidently and chuck it around. They have the same tall height, but in better places (G403) or is simply shaped better to squeeze (DA) during gameplay.
So, to me, this mouse is arguably the best to simply hold, but for playing, I think I'd need something else. If I had a larger hand, this would probably be perfect, but as it sits, I'm having trouble.
Logitech G603 (91g)
Allsop Raindrop XL
Razer Goliathus Speed