I am thinking of getting one off ebay. They are pretty impressive for the price (wifi N speed, 500GB HD, 4 port network hub with USB port to share a printer or another HD, and shared network storage, for $150 with free shipping). After using time machine and easily backing up, and restoring settings to a new MBA (yes I had a rev A for 2 days and quickly ran out and bought a rev B at Best Buy on clearance). Amazing how well Apple has all this work, I look forward to wireless automatic backups. So, any feedback on these units?