Product works very seamlessly, and addresses a very clear need without compromising the ability to apply future firmware updates, etc.
One thing I would like to see, that would better justify a $15 fee (as opposed to $5-$8, as others have noted) is the ability define a portion of a song or sound prior to transfer. Also nice would be some preference for on-the-fly downsampling of the snds, since that's another manual step, given the shortage of space on an 8GB iPhone (and the fact the speaker can't play stereo, etc.)
Very nice, if simple, piece of software.