The rebel is the marker that I am currently using as my primary. I put an X-core expansion chamber on it and an Ultralight barrel. First of all, this gun was really inexpensive. (I don't say cheap because it sounds like it's cheaply made.) I got mine at RockyMountainSport.com for about $50. I am used to Brass Eagles so when I shot this I thought I was in heaven. It shoots very straight and it is very accurate even from long distances. It is very easy to take appart and clean. It's also very light so you can manuever around pretty easily. The only problem that I had with it was that I was shooting Diablo Midnights which were really small and they kept rolling out of the end of the barrel. Then, when I shot, paintballs would break like crazy and I'd have to clean it out. Other than that, if you get big enough balls, it's a great gun.
I reccomend this to everyone. If you're looking for a good gun, buy this and upgrade it. If you need a back-up, buy it anyway. Just don't use paint that is too small.