I know they have their own race series somewhere or other, and they seem to be reasonably priced, but are they any good??

There are several types of Kumho tyres, high mileage road and semi cut slicks. If you mean the last ones, I have run Kumho V70's on P1 17's for 2 years, and hill climb the car also on the same tyres! They are very grippy in the dry, ok in the pouring wet and have done 5000 miles and are still good.
Cost is about £110 each all in.
Good luck, Graham.

Hi

I have the 712 ecstasa supra 215-40-17s on all four corners and i must say iam very impressed with them.
I got from www.xpediatyre.co.uk They did them for £220 delivered.

My bugeye came with 2 kumhos on the front. There pretty low on the tread level, but understeer like crazy. These are probably the cheapest model though as im guessing the garage just stuck them on to replace the dead ones.