Hi Sean. I think in all fairness and speaking only for myself. When my Hi line gives up the ghost I shall be looking at mounting my iPad or such into the dash connected to an amp. As the tablets are available now running iOS or Droid and allow calls, sat nav and everything else it will be cheaper buying a tablet and amp rather than a unit, ( and it IS a NICE unit to be fair), in the long run.
That's only my view mind and doesn't mean to imply that you are not doing a fantastic job and unswerving service.
Regards. Steve.