I have had them all, rotate them out fairly often, and they all have a special place in my sock drawer when I am tired of them. The aimpoints are nice, batteries last forever it seems and they work. The ACOGs are very neat. I like the slight magnification and precise aiming point on them but the reticle is not as "large" as I like on most the models. The Eotechs also see to work forever but only certain models have the AA batteries which last a long time the other ones eat batteries. They all seem to resale good but I'd have to give the resale edge to Trijicon's, they seem to get a better rate of return on them vs a used eotech or aimpoint.
if you wanna try a good red dot before you invest much money maybe look at the vortex strikefire. I just got one in my hands this morning to paly with this weekend and so far I think its gonna be a good little reddot.