@stuartk
Emotional and physical engagement are topmost priorities for me. Have you owned any of the smaller Harbeths?
Sorry just saw your post. I don't know why I'm not getting notification emails from audiogon anymore. To date, I have owned Harbeth P3esr (in home office), M30.1, SHL5+, and M40.2 (still own). For me, the engagement factor with these speakers is very high. There's a level of realism -- especially vocals, that is quite addictive. I understand these speakers are not for everyone, but they are world class when it comes to tone, timbre, and emotional engagement. They're also a very forgiving speaker in that it makes bad recordings tolerable.
On the negative side, they're not the most dynamic sounding, and they don't disappear as well as some other speakers.