I would try and speak to some local dealer about the functionality of the unit before you buy it...
Reason I say that, is Pioneer has a six disk DVD changer but it uses the IP-Bus and the AV-Bus... So, it is "incompatible" with the D3... The D3 only has the IP-Bus and not the AV-Bus...
So, my initial concern would be, you will have to hook this DVD player up to the IP-Bus and to one of your AUX video inputs to view movies...
1) Will the IP-Bus control tell the D3 to auto switch to the AUX video when you play a DVD???
2) Will the IP-Bus control DVDs and CDs or just CDs???
3) Right now you get 4-speaker surround sound from the D3 when you play a DVD in it... Will you get the same from the audio coming through the DVD player's IP-Bus or does the IP-Bus only handle L/R audio???
4) More and more questions...
If you can talk to someone or get a copy of the manual and get some of these questions answered, it might be worth looking into...
True, it is low cost and from a third-party company, so yes, buyer beware... But, I have bought crap from Apple and HP and Dell before too...
Personally, I'd drop $300 on it if I could get acceptable answers to the above questions... But, that is just me...
Good luck,
Mark