The nice thing about clipless is that your feet will likely come out in a high-speed crash. It's the slow speed falls that will get you. Powergrips and cages keep your feet locked in unless you pull straight back. In a high-speed crash, you can tear up a knee pretty bad if your feet don't pull out of the strap. I would highly recommend getting used to clipless (stupid name) for the safety, despite what your experience might suggest. It seems counterintuitive, but it's true. Also, clipless pedals keep your feet from sliding off if they get muddy or icy if you're trying to execute a bunny-hop or similar manuever. I've smacked my shins numerous times when riding caged pedals, because my shoes slipped at the worst times. If you don't feel comfortable being clipped in, get some good platform pedals and skate or mountain bike shoes designed with a flat sole. My favorite shoes are from Osiris.