i personally have not purchaseed a refurb, but i am looking into an older ibook or imac. But after reading other peoples responses on other sites and this one, it seems like usually you either get a great machine for a great price, or you are getting basically a "lemon". With the new 20" iMacs, i would be wary, because there have been a lot of people experiencing issues with the airport extreme such as mind numbingly slow downloads that oscillate in ther ping rates. As a result, they find the problem and just take it back for an exchange at the apple store. Many of the "geniuses" at the store dont know how to fix this problem, or even the source of it, so the machine might look beautiful but have a rediculously slow internet connection rendering it sometimes unusable. the ethernet is not affected by this since it is with the airport card though, so if it is a primary desktop, you should be ok.