I've owned C7, C7es2, C7es3 and SHL5+ and to my ears each was an improvement on the other. The SHL5 plus are easily the best of the lot for me.
I use with a Luxman l505u amp and d-05u player. While the Harbeths work ok with a low powered amp - I had a Leben cs300x, more watts is beneficial particularly with rock, electronica etc.
While the pluses work ok in most poistions I also found they were much better quite far apart - 2 plus metres from driver centre and toed in to point at the ear or even nose. The main tweeter needs to be at ear level too.
I can't compare SHL5 to plus though.
I use with a Luxman l505u amp and d-05u player. While the Harbeths work ok with a low powered amp - I had a Leben cs300x, more watts is beneficial particularly with rock, electronica etc.
While the pluses work ok in most poistions I also found they were much better quite far apart - 2 plus metres from driver centre and toed in to point at the ear or even nose. The main tweeter needs to be at ear level too.
I can't compare SHL5 to plus though.