One (very slight) drawback of the LouderLogic iPhone version Ive been using for past several days is that—unless Im missing something—it lacks gapless playback...not quite as jarring as a home stereo but theres a slight gap between tracks nonetheless...not good if listening to live shows. Otherwise, Im glad I found this app; sound quality and processing, and especially the iPhone volume override are big pluses.
Cotton-Eyed Moe about LouderLogic for iPhone