Finally got around to changing the RCD500 Headunit in my Gti for an Alpine BT103 and all I can say is WOW!

With the factory 10 speaker upgrade that my car came with, the improvement is amazing. I've upgraded plenty of HUs in the past, but this has been the greatest improvement I've ever experienced. The RCD500 must be very underpowered as the Alpine is so much clearer and powerful.
I used the VW single din fascia adapter so it looks great too! I also have a nice deep shelf to put my phone etc.
The headunit also comes with Parrot Bluetooth as std, but not had much chance to test it as we managed to get it fitted just in time for the Brazilian GP!
It is pretty nerve racking removing the old headunit, and you have to be careful not to scratch the dash, but it is well worth the effort.
Soon I will be adding the 12" sub and amp which I bought ages ago as the Alpine BT103 has sub level and High Pass Filters to allow it all to be properly configured and balanced from the HU. I will also fit the Alpine high speed iPod lead at the same time.
Tomorrow I will have a go at connecting up a USB pendrive to the front mounted USB port to play some mp3s. TBH this is the only weakness of the unit - a rear mounted USB port with an extension lead into the glovebox would be much neater, but when I get the iPod cable this comes out of the back of the unit so I will run my mp3s off my iPod Touch in the glovebox
All in all a successful couple of hours!
