Originally Posted by mander
That's not true. Unless you have the special spd cleats that are hard to find and coloured gold, all spd cleats release just like any other clipless system. I personally have never had a problem with spds and like them very much.
No it is true. I've vertically unclipped from SPDs but have never vertically unclipped with any other clipless system. Not all clipless systems have the same type of clip/release mechanism.