My Dreamlite Compact Bottle .22, with the 300cc bottle, gets 60 shots between refills using 14.3 CPHP at 840-ish fps (actual number is escaping me ATM). You can easily change calibers, barrels, furniture, etc, although FX isn't exactly giving replacement kits away. It shoots ragged holes at 20 yds with CPHP - I haven't had a chance to try longer ranges or other pellets, except for a few rounds of Barracuda Green. Cocking the gun and the feel of the trigger are pretty awesome. In its current configuration, the gun is pretty light. The only beefs I have with it are that out of the box that 18-round (for .22) magazine is huge, and requires high scope rings. And that the gauges are in Flyspeck 3, and are a little small for my old man eyes.
ETA: that's with the 320mm barrel. I guess you're giving up some efficiency for that short barrel.