Switched from spd's to crank brothers eggbeaters, only did one horizontal with the spd's when one of the bolts fell out when riding, went to clip out and the shoe rotated around the cleat, had to take my foot out of the shoe to get back up.
Now the switch to the eggbeaters has been rough I do not know why but I ahve laid it over three times in about 3 months, have had a "hard" time making the switch.