I have a cheap cut40 £150 that I use on 1-3mm sheet and it works well enough with a little practice,any thing over 4mm and it struggles to make a clean job of it. You have to use a straight edge or a curved guide fence and be very smooth with your movement, you have to drag the torch across the material not push. They are sensitive to the balance between air pressure and amps much like welding is. Great little tool if you use it say 2-3 times a week but you may better off with a 4" and 9" angle grinder if your only going to use it to build a Roadster.
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