I have been happy with my EoTech 512. For me it has more to do with the field of view. I'm blind in one eye and to not have to have to look through a tube is very helpful in close quarters or just moving from one target to another. And for the money it was a better choice then the others.
Aimpoints today come with a 2 year warranty. Link: Warranty
Same as EO Tech. Link: Holographic Weapon Sights Warranty Information | EOTech