I bought this off Play the other week for my old Xp Desktop, and I'm very impressed with it o far, it looks great and is no bigger than your average book (hence the name my book), also it's very quiet which is a really nice touch, it's pretty speedy too and compares to my 200GB internal Seagate SATA drive, which by the way is very loud indeed, so it should be fast enough for most game installs.
The only advice I'd give is that if you are using win Xp, use USB 2.0 and set the drive to the performance setting instead of the much slower quick remove setting and your away, oh yeah and it does'nt work on USB 1 on my machine so make sure your computer has a USB 2.0 port to spare.
Good features include:
auto off after 10mins of inactivity which helps greatly to reduce unessasary drive wear and it comes on again if you decide to use it, Auto on/off with pc via USB2.0, Status icon on bottom right (windows) which tells you how much space is used and warns if drive becomes too hot, 7200rpm (fast), quiet and compact and comes with USB and Firewire cable's.
Overall good looking, quiet, well desighned with ease of use in mind, good value-perfomance and more than enough capacity for most most home users and an ideal backup tool to keep two copys of all those precious memorys.
How to set the drive to performance setting with winXp:
Open my computer and right click the drive icon (Blue WD), now select properties and when the screen appears click hardware, after this double click the WD external USB drive now select policies and optimize for performance and your away.