I believe that is the sight that Bobby Parks uses and I think he really likes it....eh, Bobby? I'm thinking about getting one before next spring myself.
I absolutely love it. It gives you a great sight picture and you can still see down your barrell as with beads or fiber optics. I was having trouble focusing on my front and rear sights and this solved the problem.
As far as durabilty I know a number of folks who have used them for years. They are very low profile and for a few dollars you can buy as part of the mount a protective bracket. I would think they are less likely to get knocked off than a regular red dot scope
I had mine tapped and mounted by a gun smith. The battery goes off when you slip the cover back on although it has an on-off switch.
I would turn mine on before good daytlight and it was blinking which made me think the battery was low but it was not. The battery life is supposed to be great
I consider it one of the best purchases I've made in years