Fits the hand well and weighs next to nothing, great for gaming.

Mouse wheel came apart on me within the first week.

Not worth the cash for shoddy craftsmanship.

Low weight, large side buttons, nice RGB lighting, quality mouse feet, very flexible cord

Rattily mouse wheel, "crunchy" side buttons, squeezing the mouse with both hands in several locations causes some switches to be actuated, software not compatible with Linux

My mouse started out fine, though the mouse wheel had a rattle straight out of the box (which is very annoying when doing quick flicks, as you I feel/hear it bouncing around). Its software also isn't Linux-compatible (at least not officially), so if you need to reprogram it, you'll need your own Windows machine and do it from there. I have 18x9 cm hands, and while the ergo shape is nice on this mouse, I find myself shifting my grip around it constantly between being able to reach the Forward side button with my thumb, or having a more comfortable grip at the base of the mouse by sliding my hand back (and losing easy access to the Forward mouse button in the process). As such, I don't think I can safely recommend this mouse for people with smaller hands. After a couple of months of usage, the side buttons started emitting "crunchy" sounds when clicked. This is probably due to the plastic buttons becoming loose and not resting on the switches properly. What happens is like a "double-click" in terms of sound and feel; one click when the plastic makes contact with the switch, and then another once the switch gets actuated. While a great mouse in concept & design, the actual product that I have in my hands is not something that I'm thinking about using in the long-term.

Super Light, Strong, comfortable

None!

I have seen a noticeable improvement in my aim with this mouse and I can game longer without having my wrist getting all tense and sore. Looks great with the rest of my setup too!

Great shape, light weight, software optional, improved cable is nice over the model O.

Lousy QC - my mouse had a loose right-click and a sticky scroll wheel.

Great potential with this mouse. I'm disappointed with the one I got. I'll exchange it but Glorious has to be tighter with quality control; and it's not the first time I've had issues with their stuff either. If Glorious can nail down the nagging QC issues they would have a very solid product line.