I just went through this exercise helping out my dad for his target pistol.
There's a lot of cheap holographic sights out there and many of them are made by the same manufacturer under different trade names, so for this reason selecting one gets kinda confusing.
Bottom line I found you get no free lunch
If it's cheap...
it's cheap for a reason.
Regardless of which one you chose, check it for paralax at different distances before you buy it
Here's how you do it...
Just turn it on and lay it down so it points at something some distance away
Stand back from it and look at the dot
Move your head around so you view it from different angles and watch to see if the dot moves or stays in the same spot relative to what you are aiming it at.
Then aim the sight at some other distance and repeat
The dot will not move much or at all (per the human eye) at a wide range of distances on a good model (and some cheap ones)
Some seemingly good models will not do so well under this test
Another point to watch for is the models with a switch to select from several reticles. This is generally not a good feature because the point of aim will change as you switch from one to another.
Best one has just one reticle and a brightness control.
Dont fall for the gimiky extras
If you are not prepared to spend the $$$ to get a good one, it's probably best not to get one at all, unless it's for a ten year olds C02 pelet gun
