I've done two builds; the Klon clone, and the monster Lab L5 preamp. I can't say enough good things about Aion. The boards are top notch, and well thought out. Buid docs are quite complete, and Kevin is always ready to respond to any questions regarding any of the projects (God knows I've bothered him enough with questions, I always got a response).
Here's my Klon clone (Refractor);
The L5;
I was lucky enough to get the enclosure and tag from him as well.
I'm now waiting with bated breath that he puts out the Guyatone PS-021 board soon.