Thank you both for your quick replies, I'm not sure now?? I have just bought 6 heater controlls so the rns 510 would be better to work with the heater display correct? But I'm not too bothered about that, the post code input doesn't really bother me and my mfd2 has recent maps and latest software update and it sounds pretty good with the 10 speaker upgrade... It's a lot of money for very little brother looks of it. Can I make my mfd2 play dvd's?