Hi Dave,
Yes, the trip computer still works great through the steering interface.
Having had a Sony, I'd certainly recommend a JVC for the Micra.
The Sony doesn't have threaded holes in the side of the stereo to screw into the cage, this makes installation much more awkward.
I've got that particular JVC and it is great for the Micra.
If you want to see what it looks like, I can take a pic of mine?
If you need any help fitting it, I can talk you through that too.
