When combined with iHome Sleep, the free Android app from iHome, the dock will let you change the alarm tone or wake to music on your Kindle Fire. Or at least you are supposed to be able to play your own mp3; a couple reviewers say that this feature didn't work. Another reviewer indicated that the dock couldn't charge his original Kindle Fire.
I happened upon this dock late Sunday night when Amazon was selling it for $20 off the regular retail of $60 as part of a Gold Box deal. My unit is on its way to my home and will likely arrive before I am back from San Francisco. When I get back I plan to try this dock and the related app and post a review.
Have you used it? What did you think?