The drawback of that style of pedal is that that you have to look down to clip back in at intersections, right when you'd prefer to be having your eyes on traffic. Some people like them, others (like myself) have used them and don't like them.

Are you planning on doing rides longer than 4 miles? It's debatable whether clipless makes an improvement in efficiency, but for 4 miles I'd think you'd end up spending far more time changing in and out of shoes on each end than you would gain from clipless.