I went on a trip where everyone had a jet-boil, and I was amazed at how ridiculously easy they were to handle
I've been using the same Jet-Boil for over 5 years and have never had a problem at any altitude (12.5K') or temperature (low twenties). I hear regularly that you can't trust isobutane/propane at low temps or elevation, but that's not been my experience. Can't personally speak to JB's performance at higher elevation or frigid temps, but I know people who can and swear by it.
I have a hiking buddy who is a big liquid fuel fan. We go on a trip, he brings his cherished MSR, I bring my JB. I'm usually drinking coffee while he's still fiddling with his connections, priming it, setting up the wind screen. It
is ridiculously easy to use, lightning fast (
Jet-Boil), and compact. The only downside I've experienced is that, due to it's tall nature, it can sometimes be tricky to balance. And, of course, the auto ignition fails after a few years.
