@oceanandmountains I mostly pair the Aavik with my Joseph Audio Perspective2 speakers and it drives them quite well. I also have Harbeth SHL5+ in the second system but to be honest I only tried them with the Aavik once and that too for a few hours only.
Overall, it provided more control - better bass, extended treble, and finesse. The only downside I noticed was that the Harbeths sounded a touch on the drier side compared to the Joseph Audios. Apart from that one minor quibble, I think the Aavik compliments the power hungry Harbeths very nicely. It really grabs the woofers by the balls and makes them do what it wants.