Fits nice in my hand, I'd say I have average sized paws.
The thumb buttons are withing easy reach and don't effect the mouse position, the "sniper" button is ok but cannot be binded to any other function that ultra low dps.
If the sniper button isn't your cup of tea there is another Corsair mouse without the button. You also have 3 customisable dpi setting you can change on the fly which helps as I use
200dpi Sniper Butoon
400dpi Infantry
800dpi Tanks/Armour
1100dpi Heli/Plane
All there are the press of a button. The led lights are also not intrusive and don't interupt gameplay for me. I hardly notice them tbh.
The weight is good and can be altered if you buy different weights it alsohas a lot of customisable features in the downloadable software. Tracks well and has improved my fps enjoyment a lot, I can game for upto 7h and my hand doesnt feel tired afterwards. The green and white colours don't appeal to me I have the black one and it does pick up some sweat residue from your hands but that doesn't impinge on the performance.
The usb lead is huge and very sturdy braided design. Solid USB connector and it's Corsair which means the build quality is generally good, although I have heard mixed reviews on their RMA department.
If I was you I would go onto the rainforest website and buy a few and then return the ones you don't like. Think you have 2 weeks or something.
A mouse is very personal, I bought mine because overall I loved the look and haven't regretted it since, I bought a Corsair smooth MM and its very smooth
Just my 2p.