I'm not saying combo's are bad; they're just not for me.

In the time I listed, I was running SPD's; one pedal locked up on me, wouldn't spin as I pedaled. I took them off, put some platforms on until I could get new SPD's, took about a week. But I had used clipless for so long, my pedal action had changed, and to counter the foot-slipping-off-the-pedal act, I had to modify my pedaling style for that week. THE CRAMPS IN MY CALVES WERE EXCRUCIATING!!

New 515's cured that in less than fifteen minutes. At that point, I vowed to never go without clipless again. I run Time ATAC now, and have gotten even more picky; now I won't go back to Shimano!

Neither will I pedal any distance longer than my driveway without being clipped in....