Good points:
-Very big so you don't run out of space doing a 360 on a FPS! - don't get this if you don't have much space
-Long lasting, had mine for over a year and it's not even scratched from using a mouse on it every day.. and using it as a coaster from time to time
-I only ever use the speed side, but it's the only mouse mat I know of that if you don't like it - you can try another one on the other side
Bad points:
-Quite cold when first using it because it's made of metal
-Some people could think it's too big i guess
over all 5/5 it's done me well