Easy to install
Easy to adjust
Battery is exposed
I bought this sight for about $15. It was very easy to install, it mounted right on my Flatline's shroud. It's very easy to adjust, just two screws to adjust height and center. It looks great on my gun, it definitely fits in with the look my gun has.
It's decently accurate. Paintball guns by nature are not accurate guns, but this sight is pretty close. I'd say that 7 or 8 out of 10 shots will hit within an inch of the dot at 50 feet. at 100 feet, it goes to about 6 or 7 shots. 150 feet, it goes down to 5 shots out of 10. at 200 feet, 3 or 4 shots will hit within an inch. That is great for a paintball gun.
There are two problems with this sight. One, it seems very delicate. I'm afraid I'm gonna break it sooner or later if I handle the gun too roughly. Two, the battery is exposed. I'm a little worried if I take a direct hit on the sight and the battery gets hit. Other than these two problems, this is a good sight. It's hard to beat it's performance for the price.
One of the cheapest sights available, performs very well. Just don't treat it roughly.