Legacy XD series for tube amplifier thoughts

When I look at the landscape of full-range speakers, there are many options of course, especially in the $10K to $15K range. But the vast majority of those speakers demand SS amplification, mainly due to the idea of driving woofers efficiently. Yes, there are speakers that are efficient and can be driven full range with tube gear but it often seems a compromise, especially when it comes to room size and the ability to tune a room for best bass response. Then it seems it becomes a bit of a crap shoot finding a speaker that is dynamic, resolving, bass that is not shy about reaching depths that much of our music explores and doesn't cost north of $25K. Oh, and is tube friendly. 

I do have a thread opened on Harbeth 40.3 speaker but ultimately felt it was not a match for our room and some of our music. We want to play it all.

Which leads me to the Legacy XD line. Highly efficient it seems. Built-in woofers that go really low cleanly and have SOTA flexibility for in-room response. What's wrong with these speakers?