There are now a lot of Android head units on the market and I spent a long time researching which one to buy for my BMW 640 Coupe. I eventually chose the XTRONS 14.9" unit. Delivery from China was very quick (only 6 days). The unit was really well packed and the quality is exceptional. My only criticism is the lack of an installation manual but XTRONS provided video links to Youtube showing installation in my car and detailed wiring diagrams. The installation is effectively plug and play and it was all completed in a day. Some system setting changes were required to configure it to my car but the very impressive technical support provided resolved these issues within a day. So far, I am very pleased with my choice and it has transformed the cabin of the car. There are certainly cheaper alternatives out there but I doubt that you will find better quality or customer support. Highly recommended.