Rustrp,
Thanks for your input.
According to my LWS a few years ago, when I bought a new Smith Medium duty set, the differences between the acetylene package and the LP package were the fuel gas regulators and the actual cutting tip. The LP regulator has a max delivery at 30 psi, while the Acetylene regulator has max of 15 psi. In my use of LP, I have never exceeded 15 psi because the size tips I use. Yes, some rosebud tips and big cutting tips require a higher pressure, but I have had no need for the big ones. So.... thinking that some day one of my grandsons might inherit my Smith torches, I bought the Acetylene package, plus the LP cutting tip. The max pressure to be delivered by acetylene should be 15 psi, as it can become unstable somewhere near 30 psi. (Unstable may mean BOOM!). So I bought the combination that satisfies my needs and will be safe for use with Acetylene, if that is desired.
I know that Oxy/LP does not give satisfactory heat for welding steel or aluminum, but I don't weld with gas. It is much faster forme to use the MIG or stick, and likely much cheaper than gas welding. Besides at my age, I am too shakey to control a gas torch making a weld puddle. But with both hands on the MIG torch or stick stinger, I can make acceptable repair welds. I am not speaking against gas welding, but am pointing out that there are other possible valuable uses for the Oxy/fuel torch set. To each their own. And knowing the safety precautions for the system one chooses to use is very IMPORTANT.
Paul in MN