yo bro, M800 user here, no issue what so ever except the lighting, i had to RMA mine before the warranty expires, So overall i would give it a Solid 7.5/10 due to design and also software flawed, i expect higher quality on the product if i paid so much for. But if you ever consider other brands try check out Corsair M95 platinum, that one has my eye on it for awhile now.

the design looks cheap, but it does its job well, i mean for the price u paying for it its somewhat not worth for me, but if u are same steelseries fan like me then it should be no problem, but like i said u should have a look at the Corsair 95 platinum, it looks more cooler than M800,

Rating
Build quality design: 6.5/10
Function on daily use: 10/10
Gaming (FPS,moba,etc...):  10/10
software: 6.5/10 too simple, i would love to have the corsair engine rather than steelseries but its really user friendly tho, too user friendly for me
Bang for Buck: 5/10