My phone is a Samsung Captivate, though I got it new, not refurbished. However, I have purchased refurbished equipment before, both for personal use and for business clients, and have never had any more problems with it than with brand new gear. Just make sure to check the warranties, support options, and return policies before you buy. That applies not only to this offer from AT&T, but to refurbished in general.
Anyway, check it out if you've been considering it, or pass it on to someone who may want to. I can't say enough good things about my Captivate. The only issue I have with it is the GPS leaves much to be desired. I've read rumors, though, that this should be resolved when they relase Froyo for the Captivate. Of course, it goes without saying (but I'm sayin it anyway!), Android is in-freakin-credible! Okay, enough lauding (is lauding a real word??) the captivating Captivate. Here's the link: Free w/new 2-yr contract Refurbished Samsung Captivate. If this is the straw that broke the camel’s back for you to switch, let us know what you think after you pull the trigger.