In reply to drunken monkey:
My joints held up fine wearing the Speedcross, the course is rough enough to justify them although a slightly less knobbly shoe might have been quicker. There's only a short stretch of tarmac through Kinlochleven which was uncomfortable to run on (I seldom run on the road). I fast walked the climb out of Kinlochleven so had time to recover.
I did the Kintyre Way 36 in Speedcross as well. I find them comfortable for long runs but not particularly durable. It might be the shape of my feet but the mesh at the toes always rips and the hole gets bigger quite quickly.
I believe the 4 has now been released so you should be able to get some good value 3's online.