you get what ya pay for, i have a small assortment of low cost red dots of different cost and manufacture and i can assure ya a $150 aimpoint clone isnt gonna be as good as a aimpoint, or an eotech, just aint happening.
lots of them arent waterproof, and the dots fade in bright sunlite to name just 2 faults.
thats not to say a lotta folks might would be ok with the cheapies if ya dont plan on any rough stuff, or dont mind the dot washing out in bright sunlite, dont plan on using it in the rain, etc(in other words ya arent gonna put your life on the line with it), but no they arent as good.
imho if ya are gonna go cheap the tasco pro-point is the best of the lot and is gonna be better than most any clone, they run about $110 or so, and look kinda similar to the aimpoint if thats important to ya, and they are a lot better than a $29.95 BSA or such.