I bought my first oxy/propane kit six months ago and absolutely agree with the point Doug made about O2 regulator gauge range - it is tricky to set 2psi on a 100psi gauge. My regulator also seems to be very pessimistic on the supply side; as the tank pressure fell, it plunged from 500psi to zero in a hurry but there still seems to be plenty of gas left. I also find that the cheap single stage propane reg I bought is pretty hopeless. The supplied pressure seems to diminish as the tank cools so I tend to start with the output set at 10 psi or more and control it at the torch. I think if I was starting again I would go for a cheap reg without a gauge for the propane unless I was feeling very rich in which case a two stage might give a more consistant output.