Colin,
Software can take a lot longer than we think, this is not unique to us. To be fair your AF-4500 was shipped in November of 2010 and the first AF-5000 units did not ship until over a full year later.
Which of these items is causing all your stress?
These are the things we are working on:
1. Software to control the AF-Pilot from the EFIS screen with AP Engage and AP Disengage audio alerts.
2. AP/FD mode display similar to the AF-5000
3. Change FLARM interface from Garmin TIS to dedicated FLARM format.
4. Better handling for non unique Map identifiers
5. Larger Vertical speed tape
6. Updated ADS-B interface