I'm an owner of a Single Power ES-1, and also have a Supra-XLR still in SP's possession awaiting modifications.
My take on the situation is this. We all have our own experiences dealing with SP. They might be good or bad. A number of bad customer experiences have been made public, and it seems obvious by now that they are not isolated instances but a pattern. Single Power has lied and deceived its customers, including me, about payment and delivery issues. In particular, it has been particularly negligent regarding making delivery promises and continually breaking them. I have first-hand experience of the frustrations.
Besides the issues with business practices and customer service problems, some more info about product design and build quality have come to light. In particular, the power supply of Icarium's SS1 is... I don't know what to think about this, a shock, a disappointment, a rip-off, obvious in retrospect, what? I don't know how the SS1 sounds, but I definitely didn't expect an amp at that price to contain those parts.
My ES-1 was formerly Icarium's. My troubles with SP began when I sent it in for upgrades in Oct. 2007, was promised delivery and made payment in Feb. 2008, and then waited with increasing frustration until I finally received it in Oct. 2008.
Since then, I've been pleased with the amp. I know, this sounds like a repeat of the other SP owners who complain, complain, and then everything is cool after they receive their "best I've ever heard" amp.
But this is the truth of my experience. I think the ES-1 is the best-sounding amp I've heard, better than my Aristaeus and also my Zana Deux, though the ZD drives dynamic headphones of course. I've also bought a few tubes and some adapters from SP recently. Now, one may ask, why am I still dealing with SP after they treated me badly (see my previous posts in this thread), plus all the other customer complaints and Icarium's SS1 power supply?
Well, my ES-1 works fine, and as I said before I think it sounds superb. True, I may open up the case and find crap parts inside. It may be a bad or unstable design. It may break at any time or destroy my tubes. I'll still be at SP's mercy and may be forced to endure more frustrations dealing with them. I might be ripped off (or continue to be ripped off, depending on point of view). But for now, I'm pleased with its sound and I don't think I paid too much for it.
The only one with the power to resolve all this is Single Power. They can get their act together, change and improve their business practices, and stop lying to their customers. They can take steps to reassure current and future customers that they stand by their products. They can do many other positive things, for themselves as well as us.
Or SP can continue their erratic and unethical ways. Treat some customers well, others not so well. Continue to break promises and lie. Maybe continue to sell arguably sub-par products with questionable value.
I hope for the former, but I'm not fully optimistic. I think people should be well-informed about the potential risks before dealing with SP, which has happened with this thread and other warnings. Potential customers should be aware of all the risks. We current customers will make our own individual choices and continue or stop dealing with SP. But stopping all association with SP would require selling our SP amps, and I think that's not very easy to do anymore, for us as well as for Single Power.
Mikhail, what are you going to choose?