I was frustrated in my attempt to buy a cab from Duke a couple of years ago, but it wasn't personal--I just wished I'd gotten the cab! I have nothing bad to say about him. I put down a deposit, but things just didn't come to fruition. This happens sometimes; the things that matter, at least to me, are (1) why it happens and (2) how it's dealt with. As for the first thing, without going into detail--not that I really know or asked about any details other than what Duke himself mentioned--I understood why his situation, which I guess is still ongoing, didn't allow him to fill my order. I would have done the same in his shoes, from the little I know of the situation.
As for the second thing, a key point for me was that in sharp contrast to some of the bad actors and shady characters that have been pilloried around here for taking money and then never delivering products (we've all seen the threads, probably), Duke behaved like a gentleman. As soon as it became definite that things just weren't going to happen, he immediately informed me and then refunded my deposit, with interest, before I even had time to ask. That's how you do it.
I'd still like an AK cab at some point while I can still play (Changeling 12 Tall, by preference), but if that doesn't happen, it's OK, and I'm not at all mad about it. If the stars ever align, I'd feel no hesitation about ordering an AK from Duke. FWIW.