I built the AT17 in 2004. The pieces were expertly milled, the instructions clear (although relying on online sites documenting the process was helpful), and the resulting boat a pleasure to paddle. I've had hundreds of hours and many miles of paddling from glass-smooth protected lakes to Lake Erie small-craft advisory weather and the boat handled like a champ at all times. I like the tracking and the hard chine makes turning uneventful and accurate. It looks great.
I haven't gotten around to changing the backband and seat yet. Those included with the kit are reasonable alternatives but are primitive. It can carry a fair amount of gear and not feel sluggish in the water.
Overall, a strong, lightweight (~42lbs), good-looking and reliable boat. It tracks well, has reasonable glide and speed, and was a pleasure to build.