After much hassle with my frame pump, I decided to pick up a CO2 kit from the LBS... I chose the Specialized CPro2 as pictured for a whopping $20 (on "sale" too).
I brought it home, screwed in the canister. Everything looks great, no leaks. So to test it out, I deflate my rear tire, which was at 110PSI, and proceed to refill it with the CO2. I got about 80PSI out of it, until it ran out of steam. There was a slight leak around the presta valve, but there was nothing I could do about it as the adapter has no adjustments. Kind of lame; it's enough PSI to get you home / to your car (where I keep my compressor), but if you're touring, you still need to get to a real pump.
What's the deal with these things? Am I using it right?