I've bought refurbished iMacs from both Apple and Cancom and have a positive experience from both. Both were cosmetically perfect and both came in the original boxes, not in brown cartons. The box from Cancom was pretty tatty though. The returns policy is a 28-day period for refunds with Cancom. With the Apple Store I think you only get a 14 day period. Cancom refurbs come with their own 1-year warranty which is not "AppleCare" but covers pretty much the same, from what I know. The 20" Rev B iMac I bought from Cancom had a slight buzzing sound, which turned out to be a defective PSU - they fixed it promptly for me, so overall I've been very happy with the service from them.