I got a set of Kumho ASX for the DD yesterday. Just for posterity, I'll post up my impressions.
Kumho markets this tire as a high performance all season. It's not. It holds the road pretty well and has pretty decent traction, but the sidewalls are squishy ala balloon tire, so turn in and steering feel aren't too great. My best comparison would be (for those of you that are familiar with it) the Yokohama YK420... I'd say its a step up from the YK in performance, but same ballpark. Basically, a grocery-getter tire. No snow or rain driving yet, so I can't comment on that.
At $89 a pop (205/55/15), its pretty pricey for what you get. I'd give 'em a B-/C+

h: