I have a DS211J at home. I back it up to an attached USB hard drive as well as use iDrive from my laptop to back it up to "the cloud". I don't really use any of the extra features, just the shared folders and the time backup (kinda like VSS).
I have a client with a Rackstation 2211RP+ with an attached RX1211 expansion unit. It works very well and is rock-solid. Again just using the shared folders on an AD network.