I bought this sight to go with my first gun with a high FPS for an outdoor field. I liked the cantilever and tube style attributes to it, as well as the lens covers and small mount. The mount is made out of a very strong metal and the sight is also very durable. However, despite my hopes, this sight greatly disappointed me. First, the sight wouldn't even turn on. I changed the batteries and it didn't work still. Another thing is that the battery compartment is really hard to open due to the rubber connector. Also, the insides of the scope block a lot of potential vision through the scope. The dot selector also didn't have any indicators for brightness or color. I also needed a riser to get it over my M4's front sight.
Small mounting connector
Looks bad ass on an M4
Rubber connector will prevent you from loosing the cap for battery compartment (also a con)
Didn't work, had to return it
Rubber mount makes it almost impossible to open compartment
No way of guaranteeing that the batteries were not already drained
Lots of lost space in sight (blocks some vision that other sights might not)
No way to tell what color and brightness its set to unless you look down the sight (and mine wasn't even working so...)
Need riser to get it high enough on an M4 with a triangle front sight.