Actually, it's not quite like honda - acura. Basically pioneer has their normal pioneer decks and then they have their premeir decks. The pioneer decks run from the deh-p1500, 2500, 3500, etc. all the way up to the 9400(4 because they carried that over from last yr.) The premeir versions are from the deh-p250 through the 940. You can tell because they drop a zero. The units look cosmetically exactly the same. However the premeir versions cost about $20 more, include a better remote(sometimes a steering wheel remote instead of a card remote), a different screen saver for the oel models, higher voltage preouts for the 750 and 940, and all premeir HU's come with a 2 yr warranty rather than the standard pioneer 1 yr warranty.