Summary: I bought time capsule fairly early after the release. It was easy to set up and to configure. However after a while I started getting errors and coudn't do more backups. Looking for solutions I found it's not an isolated problem. and many others have experiencing it. Eventually I deleted the old backups and a lot of other information and started over. Very unreliable, but it's good thinking on apple's part.
Summary: The Time Capsule is wonderful when it works. As a wireless 'repeater' it let me move the family iMac away from the cable outlet. As a wireless 'printer server' it let our children (high school and university age) print from their portable computers without first moving files to the family iMac. As an automatic backup device, it backed up files for all the computers in the house.