I have a pair of Shimano touring/light trail shoes with heavy tread - it's flush with the cleat. I also have a paid of Shimano M-515s for my mountain bike. I'm thinking of getting a pair of multi-purpose platform/spd pedals for my commuter, but I'm worried the tread on my shoes will catch on the platform-portion of any multi-pedal I buy. Does anyone have any experience using running-shoe style SPDs and multi-pedals together?

I'm thinking specifically of buying either one of these two:

the Nashbar Highlander and the Wellgo WPD-95B Half/Half.

Thanks.