People That Have Upgraded From Harbeth 30.1s....

.... what speaker did you buy? 
I think the Coherent Audio line is speakers is a distinct upgrade in sonics from Harbeth.

They offer a Tannoy-esque coaxial driver arrangement, with a horn loaded tweeter inside the woofer that offers up a sensitivity of 96db.

Tube amplification will mate better with this speaker than anything Harbeth makes. So if that’s  important to you, I think taking a closer look at the Coherent GR10 or GR12 is very important.

Oh, and they’re literally half the price of Harbeths!
Interesting. Looks like they only make the 8 now though.
@dhcod He’s got a new website which lists all of his current models!
@dromme, could you please elaborate in which way the Klipsch sounded better than the Harbeth's?

As the Harbeth's are so highly rated for their midrange and even handedness, I'm guessing you might have preferred the Klipsch for their dynamics. Or was there more to it?
The last time I looked the C7 is not the 30.1!