I used to run Colway mud tyres on my XJ, and found that it was a soft compound which is quick to wear, so don't expect them to last as well as other tyres.
I had no problems with them on road, although I was given the advice to drive carefully when using mud tyres, especially in the wet. Their performance off road was good.
My daily tyres were General Grabber ATs, which were excellent on the road, and seem to last longer than the Colways for tarmac driving.
Ivan