Spds have fine for the street. I switched to them from clips/straps a couple of years ago and haven't looked back. Ive used a used set of m324s and am currently riding a set of m515s. Lower end used pedals and shoes that get walked in all day and I've had no problems. I've only popped out once ever, and I think there was some errant twisting to blame for that one.

As mentioned above, just keep up on your pedal maintainence and check/replace your cleats often. Clipless rocks. And to anwser your original question, skidding for fun or stopping is easier and more controlled IMHO. It feels like a much more
solid connection.