I’ve had C7ES-3XD, 30.2XD, and 40.3XD. All were very good enjoyable speakers that I had for several years but as this hobby is I moved on.
Currently have KEF Reference 3, Reference 1 Meta and a pair of Joseph Audio Perspective2. They do some things better but can be more fussy with amplification. At this level, it comes down to personal preference.
One thing about the Harbeth sound that I started to notice is that the bass on all three was a bit “thumpy” for my taste and not tight enough compared to a heavily braced modern cabinet. Harbeth midrange tone is excellent and very easy on the ears, although I found myself craving for more transparency, air, and detail.
If I were to get another Harbeth at some point, it would probably be the C7, those I felt were special in the lineup.