I think we'd agree the empeg doesn't have a "comprehensive" running order editor?

You can replace/insert/append/enqueue content from a hierarchical playlist structure into the running order, and remove from it by track, artist, album, year or genre. What products do you know of with more comprehensive control over running order?

Pearl has much the same feature set but because of the larger UI you can do all of that without interrupting playback, plus you can browse through the running order. Because Pearl has soup views on the player the content selection is more powerful, but then, it doesn't have hierarchical playlists (will the world ever be ready for the feature we developed four years ago?). There's also another neat feature but it wouldn't apply to the car player anyway.

Rob