The only difference I've noticed was the fact, that they're not as tight as they used to be and had to adjust them (despite I don't ride much in the winter - bad weather and short days don't really go hand in hand with the child seat).
SPDs are meant for much - they're mainly used on MTBs where they go through tonnes of mud.
I didn't have a problem clipping in to the pedal, more trying to walk in the snow/ice.
I didn't have a problem clipping in to the pedal, more trying to walk in the snow/ice.