Personally I think the clipless sandals would rock if they just weren't so ugly. Granted I'm in the functionality camp more often than the fashion camp.
I rode for about a year in cages with reef/rainbow/adidas sandals and never had a problem.... except that one time I totally busted in some gravel at night when I couldn't see it. But that was either my fault or the car with the kilosun headlights. darn bright things....