Well thanks to alot of great posts I think I really have decided on the prism. The only thing I am thinking now is if its worth buying. I mean I will have spent in the area of 10K bucks for the unit and I am just wondering if its worth it. I probably dive 50 to 100 times a year (hopefully will be closer to 100 this year). But there also is the hassles of traveling with the unit, finding the materials you need, filling odd sized tanks with irregular fitting, finding buddies to dive with, ect. Does anyone out there regret buying a scr or ccr finding that it was just too much of a hassle?