I went with MTR's originally as I got a really good deal on them, but when I was looking to chage them this year I couldn't get them readilly and even those that did have them the prices were silly. the KL71's have been ok so far, fine in mud and yesterday at the comp they were fine over some really rough tracks. They were less than a ?100 each when I bought them early in the year so cost wise it was a no brainer.
Considering the amout of offroad and on road miles my tyres get if they last 2 years I would be happy, only time will tell.