I bought this to mount on my WE SCAR behind an EOTECH 552 clone.
It looks and functions great! All parts are metal (or glass), the quick mount and flip to side both function very well.
When flipped to the side, the scope stays out of the way and doesn't bounce around. When flipped on, the sight is held in place sturdily.
Honestly, I can't think of anything I don't like about this thing.
I am very satisfied with it, and I HIGHLY recommend it for anyone who has a holo-sight/red-dot.