heating strong, not smells good.

It heats strong (especially after ten recharges, attention to burns) and lasts long.
Heat is maximum 15 minutes after the end of charging, it shows that there is quite a thermal inertia inside.
Ideal for warming a bed, removing the heater from the case and the walk between the duvet and mattress, as did our ancestors with copper bed heaters (warming-pan) full of embers.

But this heater emits an odor that makes me sick, especially in the confined atmosphere of a room, and worse by putting his head under the covers at night ... That should go I think after a certain number refills.
I replaced the polar bag provided by a cotton "homemade", it seems to me healthier for direct contact with skin.

EDIT1: I finally removed the varnish with a fine steel wool and a little acetone. The heater becomes shiny silver, and especially, no more sickness. More than an odor of heated tin, which suits me much better.

EDIT2 (November, 2013) on his way to a 4th winters with this heater that deserves 5 stars after removing varnish.