I've had my Jazz for around 6 months and so far there's not been too much to complain about.
The information system works really well, the main screen hasn't locked once for me, it's pretty snappy while scrolling etc. The drivers display is clear with loads of info , but is a bit busy.
I use android auto and Google maps so can't comment on how good or not the inbuilt nav is, I connect by cable and have never had it lose connection.
All in all I think Honda have done a great job with the electronics, of course it isn't perfect though.
Although it's generally good, the speed sign occasionally picks up the wrong one, ,the phone app isn't great, though they do seem to be slowly improving ,it has DAB radio, but not DAB+
All in all its certainly worth adding a Jazz to your short list of cars to consider.