It covers your cocking slot and doesn't let dirt and crud in.
Easy to cock back, much nicer feeling than bolt handle.
Works with even one screw in.
Durable (Made from plastic, but no paintball is gonna break it, so don't worry,
Isn't compatible with Flatline Shroud. Which may be good, because you shouldn't be using the shroud anyway. If you do use the shroud, you'll have to cut it, which could result in the upper screwhole breaking and you'll only be able to use one screw (which is what happened with mine).
You can overtighten it and not be able to cock the handle.
If you don't like rear cocking (like me), or don't have the money, get this. It looks nice, and not much can go wrong with it. Good all-around product, a neccassary first or second upgrade if you get dirty (this or barrel).