I think they sound awfully good, but, as has been mentioned, are rather overpriced for what they are. They do that magical midrange thing so many BBC monitors are known to do. If that meets your needs, and you don't mind the relatively narrow restrictions they put on your choice of amplifier, and you have the cash, they'll be hard to beat.
That's not meant to sound smarmy. As far as I can tell, getting one thing extremely right is basically what Harbeth set out to do, and I'd say they did it. That's worthy of respect. It just isn't worth what they're charging for it, to me.