They're the lowest-end battery powered systems that I find . . . acceptable. Due in part to the fact that they hardly distort at all, unless you use the iPod's equalizer.
The Klipsch iGroove SXT are the same price, and a lot better - but not battery-powered.
Before you go for Bose, give the Harman-Kardon go + play a good listen. It completely wipes the floor with any iPod sound dock Bose builds, and that includes the SoundDock 10, which is more than twice the price.
And it's battery-powered if you need it to be.