I personally have not tried them, but I have heard only neutral to bad reviews on the whole flip to side/slide to side set up on the magnifiers.
That's on some decent gear, I would use UTG but I would not do the magnifier. Just go with either a reflex or a scope (or both).
A lot of guys don't have the best opinion of UTG products. But hey, I'm not going into a warzone so it will probably work fine for me at the range.