They may look similar but they really are not similar in features at all. First off seems the Pioneer does not play MP3s. That's a huge difference for me. IMO the Pioneer doesn't look very good either. The Alpine plays MP3s, has more power, much better s/n ratio and the Alpine has the i-personalize feature. Check their webpage for a full description.SupperPupp said:Off topic, but anyone know why the 9815 is so much more than the Pioneer model that looks pretty silimar?