Way more than just a plain cylinder, this is rouded, and ready for many effects. If a paintball hids a certain part of the model you can make the bunker react and have a ripple effect, if wanted. It's not too complex that it will slow a game down, although it is pretty nice, look at the wireframe and see for yourself.
Very useful, smoothe, and nice looking. I've used this in mods for computer games, and I might use one like it in a game I'm creating.
Expect a large pack of paintball bunkers soon to save money, if you want a lot of 3d paintball bunkers.
I recomend using a free 3d-model application called anim8or (google it). That is what the .am8 file is for.