Excellent drive at a great low price. A further 3% off with Quidco or TopCashBack brings the price to £33.95.
You can't complain at that price.
This drive is not a portable 2.5" USB powered drive. You do need a mains socket to power it, but If it's going to be used mainly for a desktop PC, a laptop used only in the house, a Wii or other games console or plugged into a USB capable TV or Media Player, this represent much better value than the more expensive 2.5" drives.
If you plan to use it with a laptop or netbook you regularly take out and about with you, then this drive isn't the best one for you.
The website seems to be acting up a bit just now, has done since the weekend. But if you persevere you can get 1 ordered.