I have the Stirling LS3/6 and Harbeth Super HL5 Plus 40th Anniversary edition. The Harbeths have a little more detail. For me (in my system, with my room and electronics) I find the Stirlings easier and more fun to listen to for extended periods, especially if you like to turn up the volume from time to time (or all the time). They also seem to present a bigger soundstage than the Harbeths. They are more alike than different, but I prefer the Stirlings.
Are Harbeth the only warm and euphonic speakers in town ?
I've looked far and wide especially for bookshelf speakers with prominent full mids and a lush sound. So far the only name that comes up is harbeth. Maybe Sonus faber but are there other speakers that have similar tone but are made by a different company?