I have the Class A Luxman -595ase and I love it it. Paired with my ZU Omen Defs, the amp will run you out of the room with loud, super clear volume. I’ve never heard a home amp so clear at loud volumes..
One good thing about most higher quality integrateds is you can also add a different flavor power amp (tube, etc) thru the extra outputs while using the pre section of the integrated.
A while back, I passed up a great deal on a pair of Quicksilver horn mono tube amps. I was going to hook them thru the second outputs of the Luxman. I would just have to move the speaker cables from one amp to the other (or buy a high quality switcher).