My Boxster had a very poorly installed aftermarket head unit when I bought it. I replaced it with a double din Android unit. I also installed a back-up camera, more because I could and less because I thought it was really necessary. For me, the biggest advantage of the Android head unit is that it can run the Touque app. Torque's GPS speedo function tells me how fast I'm really going so I don't have to rely on my Boxster's notoriously inaccurate speedo. I'm well pleased how it works and looks.
How I installed the head unit here -
https://rx19jones.wixsite.com/projectboxster/projectboxster-3
and the back-up camera here -
https://rx19jones.wixsite.com/projectboxster/projectboxster4