I voted "Not terrible", and here's why:
The frequency response and directivity are very good, except for the dip and peak which could be compensating for their intended use case, so I am not knocking them for that.
What I am knocking them for, is the insane distortion rise in the low frequencies. Such distortion is, in my opinion, unacceptable for a speaker from KEF.
Yes. I do understand that the height channels aren't super important, but I believe that having good output capacity across all channels in a surround system is very important to achieving an engaging and non-fatiguing experience, and that bass distortion is just too much for me.
And if you look at my post history, you will find that I do tend to favor speakers with good output capability, as I just like the way they sound. So for someone who has a KEF base layer in their system, and who won't really crank it, this speaker would probably work well. However, for someone like me, who does enjoy turning it up (on occasion), I would want a speaker that can actually get loud.
If KEF had addressed the bass distortion, then I would have voted "Fine", since it is still a good speaker (when you ignore the response issues which may not even be issues).