Which Kumho's?
I've got 712's on the Leon at the moment, but these have been replaced by the KU31, which is apparently better.
My views are slightly tainted as I took the opportunity when fitting them to move up from 205/55/16 to 225/50/16. The fact that I think they are very good in the dry, and not so fabulous in the wet will be partly due to my up-sizing. Wear rates are superb however, and i'd class them as excellent value.
In saying that, I just stuck Toyo T1-R on the porker as I'm more interested in grip than wear rates on that.
Mytyres and camskill both offer the Kumhos at very good rates. Got my Toyos from Camskill and was very impressed with their prices and service (arrived at my door 26hrs after ordering).