My response as a newcomer to TPs, just having had mine for 5 days, is that they're great at low levels.
I was playing (my) piano recording quietly the other day, just relishing the best reproduction of piano I think I've heard - certainly the best I've heard this recording and I've heard it a lot on many systems, not to speak of hours listening critically to it during the mixing and mastering process.
I went outside the backdoor, which is quite heavy solid wood for a smoke (so shoot me) and to relax for a minute. The music really was quite quiet - you could talk quietly in front of the speakers and be understood, yet when I was outside the closed door, I could hear those occasional piano notes jump out as they do in real life. It sounded like a real piano being played through 2 doors.
One of the reasons I went with TPs in the first place was their purported lack of dynamic compression, but I never thought I would notice it at such low levels. On dynamic music, though, I seem to.
I am reminded of just how dynamic the piano can be, especially if the life is not squeezed out of it by compression during post production.
I feel that my amp is not really fully up to the task of driving them with its 120/210 watts into 8/4 ohms (Musical Fidelity A3CR). In fact I would council that these speakers would be wasted if you were planning to use a typical solid state amp of those performance figures. There would be exceptions that seem to perform beyond their ratings, like, from all reports, Dan Banquer's LNPA 150.
At much higher levels, as high as I can cleanly go, they seem to sound basically exactly the same - no sense of strain. What a relief! As a result, I am able to play my system at basically the same levels as I could with the much more efficient Tannoy Ardens (94dB/W) that I replaced with these.
I am presuming this is because there is so little distortion from the speaker as I turn up the wick that I am able to use all the amp can give, whereas with the Tannoys the efficiency didn't help because my tolerance of distortion was the limiting factor in how loud I could turn it up. I now know this must have been well short of the amps ultimate output. This was completely unexpected and a serious bonus. That means I can take my time to choose an amp.
In choosing my amp, I am tempted to compromise ultimate quality in favour of big power, like 400-500 watts into 8 ohms.
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They have one characteristic that reminds me of a story I heard about Quad 57s back in the 60s where some lady in Montreal returned hers to the store, saying they were "too realistic" and made unsuitable speakers for background music. They were too distracting and she kept on thinking someone had come in the house.
There's a bit of that with the TPs - hard not to pay attention to the music even when it's played very, very softly.
Reading between the lines of your email, Daemon, I'd say you wouldn't be disappointed
