The main difference that you will notice is the up conversion of SD DVD's. Oppo has a very good up conversion. Also if you choose to use it with your cable/satellite provider, you may or may not notice any difference. For Bluray playback, it is highly doubtful you will notice any difference either. If you get the 103D, you will notice a difference in pic quality from HD/Bluray using the Darbee. Everything will seem sharper. Don't expect to see a difference with SD channels.