My only concern is that it is built by a small enterprise, namely Don Sachs, so not sure how warranties and repairs work once he retires or worse.
Interesting point of view. My concern has always been that you cannot match the performance of a really good integrated without equally good interconnects, power cords, cones, rack, fuse, etc. and by the time all this is done you have spent way more money to get about the same results as the integrated. If that.
I wouldn't worry about warranties. Herron Audio is in the same situation with Keith Herron. I would think that for every one who frets what if it breaks there are at least one or two who will wish they'd gotten one while they could. Small companies cannot afford to be fixing stuff. Their name is on the face plate, they see it before it goes out the door, and so if they've been around a while with a good reputation then the warranty is the last thing I'd worry about. But then I am very selective and thorough.
For your amp, Raven audio would be on my short list. Ahead of Prima Luna, because as good as it may well be it is made in China. Raven is made in Texas. That's better even than being made in the USA.