Purchased a MacBook yesterday from the Trafford Centre, Manchester,UK and it is working well with no issues. It has a serial number that shows it is a week 21 model and I wonder if any changes/revisions have taken place because it is not exhibiting any symptons that have been reported (as of yet ). I also stuck in a 1gig stick courtesy of that ebay seller Flashman and that also seems to be fine (Adata brand). It was some job sticking it in mind ). One happy machappy customer here.