Also, I have the Primaluna power amp. I didn't get the integrated amp because I wanted a stepped volume pot...something a bit better than the Alps unit the that comes with the Primaluna integrated. The Alps pot is a good enough unit but I just wanted a bit more.
I use a Don Sachs preamp which has a very nice stepped attenuator...it's a very good match with the Evo 400 power amp.
I did compare the Don Sachs Kootenay against the Evo 400 and it held its own. They sound different. The Kootenay is a little drier, cleaner...almost SS like...while the Primaluna is warmer, with more body and tube-like.