Originally Posted by Fixxxie
Ive been using SPD type pedals of various types for 15 years racing mountain bikes and cyclocross and commuting on fixed gear bikes for about 9-10 years and haven't had problems with them. Just make sure to keep them well adjusted and CLEAN (dirt or grit will wreak havoc on their ability to stay clicked in)
As for Look pedals on a fixie IMHO it's too much problem trying to flick the pedal around while the cranks are turning all the while trying to avoid obstacles like cars and stuff.
True, step in is the only way to go for a fixie i.e. street ride clipless system. Look on the track would be a-okay & apparently is for many, butt being able to jump on & jump off (and still walk when off) is the way for the street.
One other advantage Time has, you will extend the pedal life perhaps, keeping them clean & well adjusted, but they will work regardless, the cleat will push/crush out any mud or ice that comes between, unless it's frozen into a ball, in which case it just needs a quick kick, then you can clip in & rest assured if you heard it
you are in no matter how dirty. Big plus for winter riding/messengering in the frozen margarita salt sand streets