I have a propane type that I got at Lowe's. It is OK for me as I don't smoke stuff all the time, just a couple times a years. The problem with mine is 1) on windy days it is tough keeping the flame right, 2) sometimes when it's really cold out I have to keep the flame up a little higher and cause a decent fire in my wood chips causing the temps to spike.
I try to keep foils packs with wood chips in them for my smoke, I can't seem to get them to smoke for a long time and I end up adding fresh chips, which can catch fire raising the temps.