In reply to ruttingstag:
Did three days of running on the Pennine Way in mudclaws a few years ago; we didn't pack crazily light and they were OK for me. My girlfriend wore the same type of shoe and her feet were very painful on the third day. She had done relatively little running in the mudclaws so her fee got more chewed up.
The shoes were actually quite well suited to the terrain, but we had wintery conditions (deep snow, frost-encrusted bogs etc).
In summer I'd wear a trail shoe with a neat heel; the Inov8 Roclites would be a good bet.
Mark