When we brought the KJ last year it already had
one of these fitted and when I pulled the door cards off through the year I found out that all the speakers had been changed to good Pioneer speakers (don't know model numbers, sorry). The steering wheel controls don't work but I've thought about sorting that a few times but haven't done it yet.
It plays tunes, sounds OK for what it is and BT seams to work well so I'm happy. I'm no audiophile tho.