I don't believe in wearing "special" clothing to bicycle. No way would I wear shoes that make walking more awkward. So I've used toe clips before, but even then, I typically wear either boots or sandals, and neither fit well into toe clips. Maybe those power-grip things could work for me but honestly, I often bike faster than spandex-clad cliped-in road bikers on my 3-speed schwinn racer on my commute, so I don't really see the point.