I ordered Don's amp yesterday. I am in the queue. Good things come to those that wait, although it is not my strong suit. Don told me many times that his amp would be better than my McCormack amp with my Spatial Audio speakers,and I dismissed it, favoring SS amps with Don's preamp. It was revelation from the moment Don's amp was replaced in my system... It was exactly as good as he said it was, with a potent grip on the LF that I could not imagine. So, yeah, I heard it and I bought it. I know exactly how it will sound in my system.