Forgot to add this.
The standard COMAND interface looks very old fashioned, and I'm a big fan of using Waze for getting about. Plus I like the Android Auto in my MX5, so I'd like really fancied having it properly integrated into in the E500 rather than constantly using my phone to navigate and listen to music.
What I didn't want was a huge aftermarket screen stuck on the dash, as seems to be popular now. I'm sure that those who have done that particular upgrade are super happy with it, but I wanted to retain the OEM look.
So I opted for a unit from a UK company called Integrated Automotive, from Leicester. These guys are seemingly the only UK-based outfit who actually manufacture their own aftermarket Car Play and Android Auto units from scratch. I know there are loads of Chinese units from various sources, but I really liked the idea of UK based back up, ease of communication, and an installer recommended by Integrated Automotive themselves (Ilkley Car Audio) who could deal with any issues. It's more expensive (this unit was £615 fitted) but to me, it was worth it.
And it's brilliant.
Seamless integration, wireless Android Auto that fires up from the off, all original buttons function as they should. And you can flick back to the standard COMAND interface with a prod of a button. Perfect. And it actually has more features and functions than the OEM Android Auto unit in my MX5. I would highly recommend it if anyone is thinking of doing the same.