Price looks good for local stock, this is a desktop drive and yes, it's AC powered. Average 4 star review at amazon : http://www.amazon.com/Seagate-Expansion-Desktop-External-STB…
If you want to crack the drive inside, the video is the 3TB model but should be the same case : http://youtube.com/watch?v=11obHqzx_bw
OW still selling it for $189
be quick if you want to price match before the adjust their price