Can anyone give a review of the reball rubber practice balls that are designed to be played just like paintballs? What I would really like to know is how easy they are to maintain? Do they go out of round and if so, how quickly? Is washing them after use more of a hassle than they are worth? Do they leave any residue in your marker that is harder to remove than normal paintballs do? I did a search and the other thread did not have much info. My team is looking for ways to knock down some of our practice costs and this seems like a viable option if they perform as advertised. Anyone have any firsthand experience with these?