Pneumatic brad nailer

I am checking out some 18ga brad nailers and would like some input from you fine people.

I am looking at the Grizzly H5527 ($30). and a Craftsman #18172 ($90) I think the Grizzly is a decent nailer, but I'm not sure if you can purchase the nails at the local blue box store or not. It wouldn't be very economical to pay $7 shipping for nails, right? LOL! Now, the craftsman is a Very nice nailer, but I'm not sure if I want to spend that much right now. ( Especially after just buying a Makita MAC2400 compressor.)

Does anyone have either of these nailers that would like to share some info?

Thanks :-)

J