Quick update on the status of my unit...
I fitted it in myself last week as I wanted to make sure it worked ok. Fitting was pretty easy, there's a really good guide on youtube for removing all of the dash trim and you literally only need a t20 torx and something to prise the trim away without marking it (a screwdriver or in my case my sons plastic toy knife lol).
I connected everything up and it all seems to work very well. The dash illumination can be changed really easily to match the golf, bluetooth is a doddle to set up and the nav found satellites almost immediately. The sound quality is also a lot better than the standard vw units and gives a lot more options for tweaking things. I'm also able to stream music from my htc now which is great
I did however run into a couple of issues. Firstly, the unit was supplied with the wrong bluetooth mic. The 'mic in' slot takes a 2.5mm jack but i was supplied with a 3.5mm jack. I bought an adapter from maplin for a couple of quid but managed to get the seller to send me a new one anyway. Secondly, the unit comes with a tmc radio receiver that needs to be connected to the radio antenna in the car BUT mk5's have a twin fakra radio connector for am/fm reception and the pioneer unit has a din connection so you will need to buy an adapter. I've read that connects2 have one and there are a few on ebay but the reception can suffer with the cheap units. The seller is kindly sending me one out so hopefully it works! Lastly, the rear parking sensor and climate control display function doesnt seem to work for me. I have an older canbus gateway ('K' i think) so I'm guessing I'll need a newer one coded for these things to work. MFSW controls work perfectly without coding but the highline display will no longer show the nav route or radio info as it did with the mfd2. Again, these could be related to my older canbus but not sure.
Overall, I'm happy with it but need to refit the bits mentioned above to get it all running properly.
Only negative is that poweramp on my htc doesnt want to show any streaming music tags so I cant see media information on the display.
Oh and I almost forgot, did you get an ipod cable with your unit? If so, could you tell me the part number please as I didn't get one with mine but would like the option to plug in my ipod touch