Which cleats..

I can't decide which cleats to use on my road bike,at the moment they have cheapo plastiyuk pedals on them.
I'm looking at Shimano M520's but they are designated as MTB pedals,does this matter?Why are they so different?Thanks....
I'm looking at Shimano M520's but they are designated as MTB pedals,does this matter?Why are they so different?Thanks....

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I think a lot of touring bike riders tend to use SPD as they can also walk in them. Most road pedal cleats are almost impossible to walk more then a few paces.
Kona Jake the Snake
Merlin Malt 4
http://road.cc/content/review/16381-shimano-rt81-shoes
Shimanos seem to have good stiff soles, so I haven't had any problems with 'hot spots' from extended rides. And it's nice to be able to walk like a normal human being when getting off the bike.
I have Shimano shoes and spd's on my MTB,I just needed to know if there was avalid reason for not using them on the road...thanks very much...