I got mine off ebay, fully boxed, receipt, guarantee, etc 5 weeks old multiregion 😃 pro unistalled £400. Reserve was £500 and posted a link to a brand new one on offer at £600.
Have seen then go for £360 but £440 to £520 seems to be the norm back in March.
Refused an Alpine 9812 with ipod adapter £70 for above.
The way to play ebay is be specific and bide your time, it took me near on three weeks to get one that cheap, plenty at £450+
The major difference between the cheapies is the screen, go in to Maplin and Halfords and look at them Ripspeed, useable and better than the bargain basement £200 to £350 jobbies.
My screen works on the move ie movie video, DVD.
Nice having touch screen, there are too many specific gadgets to list with these.
The latest Pioneer is better but near on £2k, so is the Alpine D900 but stupid money. Have seen the D310 with the better of the Sat nav boxes 99?, dual tv, 6 disc, reverse camera, etc go for £600.