I've been debating between clipless with Time Atac's (what I was riding) vs a good platform pedal with pins (what I'm riding now).

It feels like any small efficiency improvements I get from clipless are cancelled out by the time it takes to change in and out of them. I'm still on the fence though.

The two things I don't like:

1. Road pedals. To hard to walk into work doing the clip-clop thing, more annoying to put a foot down at a light, sensitive to getting gummed up if you step into anything by accident. And yes, I have gummed up speedplays before without even stepping in anything obvious.

2. Those "one side clipless, one side platform" pedals. To me it's the worst of both worlds. Have to look down and flip the pedal with your foot awkwardly just when you want to cross an intersection. Annoying, and possibly dangerous. Others have said with different models the pedal always have the same side down, but that still means that one side requires always flipping the pedals. I'd personally rather just use platforms than deal with the hassle.

I like Time Atacs. I live in Minnesota and bike in the winter, and the spd's have a reputation for doing well with things like mud, but not as good with snow and ice. Atac's also clip-clop less as the cleat is a little shorter. The Crank Brothers pedals were similar for snow and clip-clop, but didn't have a distinct clip when clipping in (wasn't sure by feel if I was clipped in or not), and older models were notoriously unreliable, breaking fairly quickly and in ways that they shouldn't. They redesigned them, but since I'm already happy with the atac's no need to switch.