Did you buy it? still waiting for my G403, till then have my ec2-a
G403 is too good.
Only right click button sightly up near scrolling. If you observed carefully then you can feel it see it.
And also bump at end not have that height to hurt your palm. For removing that effect you can increase table height, as hand angle decreases and you get a good grip.
My hand size 18.5 and 10.
G403 is not for my hand size as per opinions on different sites. But I have no problem with this mouse.