As Gene mentioned the biggest issue with the higher pressure tanks is getting them filled. Also remember that just because a paintball shop will fill a small paintball tank to 4500 psi doesn't mean they will fill a large SCBA tank to that pressure, and most wont. I went through this same issue a few months back when I went from my pump to buying a tank and after calling all over the place I could only find SCUBA shops that would fill big tanks to 3300psi and paintball shops that would fill small tanks to 4500psi. As it turned out I found an awesome SCUBA shop here in Fort Worth that set me up with a standard 3000 psi tank that they will fill to 3300 psi, which gives me a bunch of fills on my S200 that likes a 2700 psi fill and has a small air tube. If I was only shooting a Discovery or something that takes a 2000psi fill then I would get boatloads of fills, so it really depends on what guns you plan on filling. Hope this helps,