Well the boundary run was no picnic. After about 8 miles I was pretty sore from chaffing in the shorts. At about 11 miles my thighs were quite heavy. By 20 miles I didn't think I would make the last 6. A few wise marathoners told me helpful things like, 'a marathon is a race of 2 halves, the first 20 miles and the last 6' - they were right! Having previously run 50k in the Mojave desert I was surprised by the both chaffing and the overall difficulty of the run.
I ran the whole way with my friend from work, Peter. We ran a bit slower than I would normally run and I wonder if that made the run a bit harder on my legs. I like running with other people though and was very happy to have Peter's company. He claims that this was his second to last ever marathon, since he is in training for the Paris marathon (I don't believe him though).
At the end of the race my legs were pretty sore, particularly the thighs (Adductors and Hip-flexors especially). Although, in the photo you can see blood from the chaffing at the top of my thighs, it was muscular pain in my thighs which was the worst.
It was after this event that I have decided to end my empirical research on the Linebreak compression tights. In the days following the event my legs suffered no problems whatsoever. The night of the event I had a shower and donned the Linebreak compression tights. I cycled about 6 miles that night and then slept in the tights. I awoke without painful legs.
The next night I cycled about 35 miles on a business trip and then wore the tights in bed. The second day after the event is usually the worst but I had no stiffness in my legs and I managed to cycle another 25 miles on my folding bike without major problems (though the head wind was a bit of an arse).
I am forced to conclude that the Linebreak tights work. I don't need further experiments to prove this to myself!