I've read things on the Jetboil, but I as much as I hate to admit, I'm still not completely sold on the idea. Mind you, I absolutely love the design and the size of it, but I don't particularily care for LPG cannisters.
See, LPG has great heat output, and doesn't need to pumped or primed and it works very well at high altitude. The only trouble with cannister stoves is that when they start to run low, the gas pressure starts to drop, and because you cannot pump more pressure into them, the flame's die. I've actually found it rather difficult to judge how much gas is left in a cannister. When they run out, a person can always hump around an extra cannister or two, but I don't particularily fancy humping an empty cannister off a mountain with me.
A great stove, just a small drawback!
Just my $0.02 cents.
Adam