Jeffs Wekstatt Acrylic Kit on my Crystal Grey Impreza STi and the 'flake pop' that was achieved once you'd built up a few layers was crazy... really good stuff and IIRC it wasn't mentally priced either.
A friend gave my old dears 330d Cab a going over and he uses Dodo Juice products, the car came out fantastically well:
Cheers,
Grant