I tried a Taboo III with my HR-1s (about 92 dB) and MG944s (94dB). My rooms are maybe biggish medium sized (this one about 13x27 with segues to other rooms) and I am used to Toriis. From this background, the Taboo was into distortion with too much material for me, and when not, often just too quiet. Even the Rachel was not enough here, though close with the 944s. Using the CSP3 or Zstage helped a little, but did not do it. For reference though, I went from a SE34 to a Torii years ago in this room with my 944s.

Now with a small room and/or very efficient speakers...that could be really good.

My speakers both sound better with more power even at lower volumes...the drivers sound like they work harder letting out more musical character.

Too many variables, including listening tastes, but this was my experience with my preferences.