I have them in on trade and found them great with my Canor Virtus Integrated and Unison Research Sinfonia integrated. Basically, lower wattage tube gear is awesome with them. I have also used Canor, Allnic and Art Audio monos with highest power being 55w and all were great.
I would guess that the 30w Class A SS amps from people like Pass and Esoteric would also be fantastic. I never actually tested them with the Esoteric when I had it here though.