I was enchanted by the Harbeth sound after hearing the P3ESR and Super HL5 Plus at a friend's house. The detail and soundstaging were amazing, and as others have said, the midrange. It was easy to close your eyes and imagine Jennifer Warnes a few feet away and hearing every breath as she sang. My friend went on to the 40.2s, which were incredible.
I ended up buying both for my home. I'm still in love with the P3ESR which are set up in a small system near field with a small sub. The Super HL5 Plus don't hold up (in my room, with my gear) when pushed to loud volumes. I usually listen at moderate volumes but like to rock out once in a while, and that's when things get a little bright. I also have a pair of Stirling LS3/6 which are based on the same design as the Super HL5 Plus. They are not quite as detailed but are a little easier to listen to at higher volumes and are soundstage champs. You have to hear them to appreciate them.