@Scotj009: finally around to having them in muddy conditions.
I've not found them to be any worse than standard SPDs in the mud. Biggest issue comes when the cleats are caked in muck and they need a little more force to make a connection.
@mars-bar-man: wow you have a good memory, or just left it in the dashboard!
Yeah thought so... Went ahead and bought some mallet Es and using them in some pretty boggy conditions at the moment and having no issues or changing in ability too clip in so I'm glad I didn't go for the shimano