I have found that a raised bed can create a really nice accent in a landscape. The reasons for a raised bed are obvious (especially if you have poor soil) but when you are walking around a lawn and you cone to a 3-tier garden with shrubs and trees and such. Cool.
Raised beds do look nice and they aren't very difficult to build. I like how you can either use 2x6 or 2x8 boards, railroad ties, or garden stones. The possibilities are really pretty endless.
I heard these systems are really nice and save the customer quite a bit of money because they don't have to call us out to blow their system out at the end of fall.