Magnifier and mount are top line products in an affordable price. I have mine on an AR with a CompM4 w/riser. Unit lines up perfect however I can not center dot in magnifier, I run out of adj. Go figure. But the dot is almost there. This may bother some of you. It's close enough for me. Swing mount is very nice, adjustable, locks on rail and swings magnifier with a flip of the finger. However it rubs on my BUIS (ARMS 40L) which is a very low pro sight. I also had to move my RDS forward on the rail to fit the mag and BUIS. Other than this the magnifier and mount are well worth what you pay. I'd also say the quality is sub par to an Aimpoint/EOtech but only slightly and I do mean slightly. I would never pay the $599 for a SLIGHTLY better unit, when this one works just fine.
Pros: Affordable, quality unit, quality mount, lines up with CompM4
Cons: Bearly fits over rear BUIS, rubber rubs on BUIS when folding and I run out of adj to center dot.
This review was written in the old system and had content requirements that are different than reviews written today.