Looking at going this route for my new (to me) SpecB. Very happy with my JVC unit, bluetooth hookup was easy with multiple phones. Mic sound pickup was sometimes not good, but I think that was how loud it was in my STI.
Just wish it was possible to put an older manual HVAC in and get the $30 faceplate, rather than pay over $300! SOA can shampoo my crotch for integrating HVAC and audio.