Hard to say how much is due to the new Kumhos and how much due to a dramatic improvement in chassis/wheel alignment but the car felt like a dream. Bearing in mind I'm comparing the Kumhos to 10 year old Pirelli PZero Neros, here are my impressions:
quiet: kumhos have much less road noise than the old pirellis. They also have much less tread pattern
ride: surprisingly, more compliant. Road seams and pavement irregularities are much less annoying
dry grip: no comparison! The Kumhos stick like glue. So far, nothing I've done have unsettled them in the least. I think I will run out of cojones before they run out of grip.
braking: if I was smart, I would have measured. That said, the car stops a whole lot harder. Makes me appreciate the big brake kit in a way I couldn't before.
I don't expect they will perform well in the wet; they don't have the tread pattern for it. I also wouldn't want to get them anywhere near freezing temps. All that said, I feel like I just got a new car. As long as your Elan is a fair-weather drive, I'd give the Kumho KU36 Ecsta Xs a look.
I want to go find more twisties now!