Anyone using the Mr. Heater "Journey" catalytic heaters?

One advantage the catalytic designs have over their open-flame counterparts is that the burner pad operates at a much lower temperature (i.e., below the ignition point of most bedding, clothes, etc.). For example, if you touch some tissue paper to the pad while it's lit, the tissue will smolder a little bit, but won't ignite.

OTOH, the platinum catalyst adds considerable cost, and doesn't last forever.