Spendor, Harbeth...why so hot ?

I have used a pair of LS3/5as (improved 11 Ohm version) for years as desktop speakers in my study. I recently replaced them with the Harbeth P3ESRs and these are clearly a lot better, with less colouration, better dynamics and a cleaner and more realistic bass. When it comes to big speakers, the Quad electrostats remain my favourites for speakers that disappear.

They are just as naturally clean and transparent as dynamic speakers go. Only my Quad stats are even more transparent. Jazz or rock also deserve such naturally sounding speakers that leave the artists' intention completely intact. However, classical acoustic music is an easy point of reference, of course.