i've been using my brs knock off for 4 yrs now, still going strong.
got mine from amazon, a 'outsmart' brand, apparently no longer available.
2 weeks ago in bridger wilderness, was using a homemade aluminum foil windscreen which I thought was large enough to NOT hold in hot air and get too hot, went to turn off the stove and burned/branded my thumb and forefinger with the little wire valve....ouch! **bleep** that hurt for a couple of days!
but happy the cannister didn't blow up