Riser was a good height amd the unit seems rigid enough. The mounting clamp is wider than the picatinny rail on my receiver, so I had to file a bunch of material off one side of the mount so the clamp plate could actually compress against the receiver picatinny rail. Also, reliefs cut into the picatinny lugs weren't deep or wide enough; the 42mm objective lens housing on my NcStar 3-9x42 scope still bound up against the picatinny lugs, so I had to file a few of those wider and deeper. I made it work because I didn't have time to return it and get a new one, but I am disappointed.
Pros: Basic, good height
Cons: Did not fit rail, 42mm objective binds against lugs
                    
This review was written in the old system and had content requirements that are different than reviews written today.