They are SWEEEET!!! A buddy of mine has one, and we've used it for several projects. They cut as well as a plasma cutter, and can weld as well as a TIG. They can do all sorts of metals too, like regular steel, stainless, alloy, aluminum, etc. They're pricey, but if you look at all they can do, they're worth it. Plus, it's a lot easier than trying to figure out if you have the right amperage dialed in, the right flowrate for your shielding gas, etc.
I highly recommend them!