I have 3 Party Pigs, I like them for small batches (If I'm doing a quick Mr. Beer recipe). As for large batches (5 gallons) they just do'nt work. Also they are carbonated with Primer then pressurised with Air. They last about 2 weeks at most before starting to go flat.
(And yes I still do Mr. Beer, I like them for quick beers, If I don't have the time or money to do a 5 gallon batch but still want some Home brew.
I found 3 gallon Corny's for $65
)) I ordered 2 of them, should have them in a week or so!
Thanks for everyone that posted, you all were ALOT of help!