I don't mean to pile on here, but since people are soliciting our experiences with Apollon, and overseas shipping...
My 1ET400A amp arrived defective. I sent an email on June 25 (last year) explaining the problem. I received a reply from Tibor on July 2, apologizing for the late reply and explaining that he had found my email in his spam folder and that they would build another amp for me. On July 15, I asked for an update. I received a reply on the 17th saying that the new amp was ready and I should prepare the defective one for pickup. On the 22nd, I sent an email stating that I was still waiting for a pickup. I received the label the next day.
I don't remember how long it took from then to receive the new amp, but I don't think it was very long; at least not longer than I expected. It has worked fine, and now that some time has passed, I've pretty much gotten over my frustration with their slow email responses and I don't have a problem recommending them - provided that you keep in mind that 1) Stuff can get damaged when shipped overseas, and 2) Apollon can sometimes be slow in responding.