Currently using a Black Magic w/ flame drop forward, Black Magic Reg., 12v VL, & other regulars that come with a STO Black Magic. Running Nitrogen in Java 88cu in 4500 preset.
This tank is absolutely awesome. I recently bought it because I got a great deal on it. (Was looking more towards a 68cu in 4500) This tank even thought made by Kingman has a great pre set out put at 850 like others. I have had no problems with this system thus far. I was playing not too long ago and got 300 shots when my tank was running on "0". (I showed my buddies before the game, so I'm not lying.) I also did not experience any ball drop off until after the 300 shots, that's why I said 300 and not more. After the 300 shots the gun began to lose distance for about 20 more until the gun quit cycling (which is about 45psi for a cocker)
Java products, since they are made by Kingman International, were originally made to be used with Spyders and EM1's. They tend to be a little pricey, but what carbon fiber tanks isn't anymore. Also many stores both online and local don't really carry Java products (in relation to tanks) so this tank might be a little hard to come by unless it is bought directly from Kingman.
Besides the problems of finding a store that carries the tank, the other "bads" are really trivial. Other people that have seen my setup were a little skeptical at first due to the Java pre set but after playing a while and seeing it perform they have become believers that it is a good system.