This is the mail reason why I did not get an SP amp when I decided to upgrade from my LD MKIII. I wanted to get an extreme with some upgrades, but there was no way if I was going to spend $1500+ that I was going to wait 4+ months to get my amp. I am not a very patient person to begin with, and for that kind of money, I shouldn't have to wait. I can only imagine how someone who's spending 2-3X that much feels about the wait.
I decided to go with RSA and Woo Audio. Their products have the reputation of sounding great, and I don't think you will find two vendors with a better customer service reputation. I can say after dealing with both and deciding to keep products from both, I have not been disappointed one bit with sq or service. In fact, they are even better than I anticipated.
I have no doubt, especially with the following here, that the SP amps are incredible. I have no doubt that Mikhail is a great guy that is incredibly passionate about what he does. Maybe someday, I'll get a chance to own one of his excellent products. In reality, until he gets his business side squared away, he will keep losing people like me to other vendors.