Yesterday I went to the house of a local seller who has listed his Harbeth Super HL5+ for sale. Suffice to say I was totally underwhelmed. I don't know if it was his setup (some Line Magnetic tube amp) or room, but I just found the sound to be bland. I have had P3esr's for more than two years now, so I'm quite familiar with the Harbeth sound. I was expecting a bigger, more expansive scale which was completely missing.
Based on what I've read about the speakers, I'm inclined to think it must have been the setup. Also, despite the size I think pairing them with a subwoofer is almost a necessity if you want to venture outside of jazz or classical at all. Any owners of SHL5+ please feel free to chime in if you feel that my impressions are way off target. The reason I say this is because when I first got the P3esr's I was similarly disappointed, but after pairing them with a Cronus Magnum II they have become one of my favorite all time speakers.