Hi Tabatha,
I'm not sure what to tell you to look for, but the price isn't really screaming "great deal", to me at least. I know that most of the units sold for lampwork use are used / reconditioned and 'modified', so not brand new. But if I'm reading this thread correctly, part of that modification is to optimize the flow for use with a torch. I'm not sure what noticeable difference there may be with an 'unmodified' unit, but just wanted to mention this for your consideration.
http://www.lampworketc.com/forums/sh...d.php?t=175472
Also, looking at OxyDocs current pricing, you could get 2 "M5" units or 1 "M15" unit for about the same price as that Craigslist unit. (Shipping would be extra though...)
http://www.unlimitedoxygen.com/services.html
A single 5 lpm unit is only $200 plus shipping from him. (I'd be sure to ask about delivery time though, as there seems to be some delays indicated in that first thread I posted.) Depending on how soon your Bobcat will be delivered, the wait on the oxycon may not be a big deal.
Also, consider what the warranty might be on the Craigslist item.... not sure how long ago it was purchased, etc.
Just some food for thought!