Sorry to dredge this one up but...
It seems a lot of you are poo-pooing Kumho tyres without having first hand experience of them.
I've had both good and bad experiences. When Kumho were becoming commonly available in this country (would say around 2002) I had a set on my Megane coupe. They were OK, but not great in the rain. In 2005, we had some on our Fiesta. Not good at all in both wet and dry conditions, but especially dangerous in the wet.
Since then, I've given them a wide berth, but I would consider fitting some to the Land Rover now. Why?
1) They are around £75 a corner Fitted for some KL78s from Black Circles.
2) They are now fitted as standard (from 2007 I believe) to the A-class Mercedes. Now granted this contract will have been won, in part, on cost, but quality and performance would also have been considered.
3) Improvements in technology. Tyres are constantly improving, and even 'copycat' tyre producers are only a few years behind the leaders. Yes, this can equate to several seconds a lap on a race circuit and the difference between being stuck in the mud in a bog, and not, but to those of us who are looking for a comprimise between ability and cost, Kumho is not a bad choice.
In any event, Kumho is now recognised as a 'mid-range tyre' by many suppliers.
I've been able to find one negative review of the KL78, and several positive ones. In my experience, tyres which are poor performing often have far more negative comments than positive since people often only review products they are impressed or dissapointed with.