The packaging is a bit clumsy. Clamshell packages are probably the most annoying things to open, almost bruised my hand trying to cut through it. Front end of the wire was completely bent backwards which probably damaged it in some way. Had to make sure I didn't cut the impossible-to-see wire and didn't scratch the casing of the mouse.
If this is your first time using a bulky mouse, your hand starts to hurt after a few minutes of use (or maybe it's hurting after opening the packaging), but you get used to it.
Clicks are a bit loud and sharp compared to my previous OEM mouse but it becomes unnoticeable. No rocker on the mouse wheel which is a plus for me (hated slipping on it when trying to use the wheel).
Overall, great mouse for 11 GBP.
Update: Been a few months now. The mouse wheel has lost some grip and I've realised that clicking Left while holding Right tends to trigger the DPI button for some reason. Extremely annoying when playing games like TF2 as Heavy while keeping the gun spinning.
The grips have also started losing their grips and keep sliding off and leaving a sticky mess. Still a good product.