Dumb question maybe, does the Jetboil ONLY use the Jetboil canisters or will they work with other prop/I-butane mix canisters like MSR's?

Jet Boil SOL Ti link at Backpacking Light

Be sure and read the whole thread, initially it seems they are talking about a "Hellfire" flame-out from a modified JetBoil SOL Ti, but as you read on, the failure happened on a NON MODIFIED stove. Roger Caffin is the resident stove-master on that forum (no trail dust on Hikin' Jim, either), both are way smarter than me, and his Roger's opinion bears notice. With that said, I've got one of these stoves as do many of you and have used it for awhile with no problems.

Not trying to start an internet war here, just thought some of you might like to read the thread at BPL,
Don