I bought one last year, easy to use but some stubborn weeds will require another
blast a few weeks later. You don't have to burn the weeds, just swep the wand over them, the damage caused by the shock to the roots is enough to kill off the weed. Of course safety first, keep the gas canister well away from the wand when not in use.
I have one, they are great fun!!
Just a warning, once or twice the flame has shot up the wand. Didn't have an accident, but you have to have your wits about you, in order to turn off the gas pronto.
Happt Weeding!