Good Work Horse
There may be faster out there, but my experience with Toshiba has been good and I stick with brands that I know... will likely buy a 2tb when the price point drops. Good units!
Slim, lightweight, and reliable; It's quickly seen by all my systems from win 2k to win7 64bit; It goes into standby quickly which keeps power consumption down (important for laptops, a pain for desktop use); Wakes up relatively fast.
All portable drives are a bit pricey compared to a replacement drive; Getting the drive in a nice case with a warranty commands a bit of a price differential, but it should be a bit less