Hi Dg70
I've just bought a 2013 cx5. Like yours it was without digital radio, which I couldn't live without.
After looking at the options I decided not to ditch the whole system and plumped for a bolt on. I chose the autodab go. My local supplier, bromley car audio, fitted it on Saturday.
It is wired into the ignition and plugs into the aux socket. It can also tune into the fm radio, but sound quality is better via aux, and you get constant interference from local and dodgy radio stations with fm.
The controller is in the little storage bin in front of the gear lever and I changed the display colour to white - it matches the clocks etc
All in all it looks good and sounds good - almost like it should be there, and it doesn't get in the way of the cigarette lighter socket
Hope that helps if you haven't already got yourself sorted