I switched to clipless last fall. It's OK, but I don't really care much one way or the other. I don't think I ride any differently with them than not. I can't get used to pulling backwards on the pedals while cranking, and the other three directions I can do with toeclips. My speed hasn't improved, and I don't feel any more or less safe or stable either way. Honestly I don't really see what all the fuss is about.

Even when I wore sneakers and toeclips, I wore a separate pair, since my ride is quite dusty (or muddy if wet) and the shoes had to be changed anyway. The Shimano mountain shoes I'm using are nice because they're warmer than sneakers in the winter.

In the spring I'll probably put the platforms & toeclips back on, just because it's nicer just to walk out to the bike and go than to have to suit up. I find having to put on special shoes to be kind of a PITA. I'll still have separate shoes for the commute, but for buzzing around the neighborhood it's nice to be able to just jump on and go rather than to go inside and put on different shoes first. Gloves and helmet, jump on and go.