The kicker dock is just that, a dock. Its not portable, it doesn't take batteries so it's got that going against it.
I would imagine it has decent sound with its components: proper midbass drivers, silk dome tweeters and a dedicated 6" sub in the back.
But you should look into the Altec Lansing box thats out, its portable and sounds amazing. It definitely rivals the kaboom in the sound department, just not the wall shaking bass the kaboom puts out.
The Kaboom is a great machine with probably the best bass any boombox has. its only weakness is lack of real highs.