I was referring to LPG, not the isobutane mixtures you cite. I agree it is dangerous and foolhardy, as with any gas under pressure.
Esbit works well, and I can use it interchangeably with the FireLite tabs, but I noticed a big difference in the MPI fuel tabs. I've only used it twice, and never with a timer, but they don't seem to burn as hot as the others. With Esbit/Firelite, I can boil two cups of water twice (or almost twice, depending on conditions). The MPI uses over 3/4 of a cube to get the same result. I bought the MPI for less soot, but I don't see me buying it again if I can get more umph out of another cube the same size. For this, I really like my Ti-Tri. Flexibility with alcohol and wood fuel options are nice to have for the occasional unplanned usage.