They work well with most of the things we have tried them on from a glorious Moon amp to lots of mid level AV Amps. I heard them at Munich with one of the NAD amps ( not Master Series) and that was surprisingly good - good enough to buy for the shop anyway!
I run my set on a Plinius amp which I love but before that they were very happy on a modest Marantz KI-Pearl Lite.