Please consider this statement: Cycling accessories, such as foot retention systems, signal membership to a certain group of cyclists, and people chose them / avoid them more for this reason than for reasons of pragmatism.
+1. This is a really good point that I haven't seen mentioned yet.
I have three bikes. The roadie has clipless and my commuters have BMX-style flats. They both work pretty well, so forget about the image or what other people think and just ride what's comfortable for you.