I've used a very similar one to weld in floor pans into a Jeep Wrangler. For small projects on thin metal, does a great job. For $100, you can't go wrong.
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I have a Lincoln Weld PAK 100 I paid $278 refurbished and the gas regulator kit was another $125. So that is a really good deal, but to get really nice sheetmetal welds you need the CO2 bottle. I paid about $ 100 for the bottle full of CO2 from local Florida AIRGAS.
Cool, thanks guys. Looks like I'll be playing with a new toy in a few days.
I'll second the "set it up with gas" vote. It's much easier to get good welds with gas than with flux cored wire. A lot less smoke and mess too.
Looks like a decent little machine for $100. It will give you a base to launch from.
You also might check out http://www.generalair.com/Training2016.aspx. They run great one day training classes. Very laid back and informative. I don't know who their instructors are down there, but up here in Greeley they hace the local Community College instructors teach the courses.