I believe the shape and weight to be excellent. A mate of mine is getting it soon.
Things I don't like about it is being able to activate the side-buttons with pressure on the side of the mouse + squeakiness.
I had a Ninox Venator before. I liked the shape and weight but I was annoyed about being able to move the shell, making it a distraction while aiming, not giving you the solid 'quality' feel.
I tend to squeeze my mouse pretty hard sometimes and even have the side-button on the G403 activating (which takes quite some force). So this is probably going to be a nuisance for me since I use mouse 4 + 5 for weapons.
I'd buy if it didn't have this problem, but this'll prolly fall apart for me within 12 months of usage + I'd be paranoid about squeezing to avoid unwanted weapon switch.
Good try though. Maybe they'll revise the mouse a lil bit and the 2.0 version won't have this peculiarity.