Ow! I had a pair of Dueggi's, I'd forgotten just how uncomfortable they were, especially on long rides. The cleats would squeak, and loosen up since they only had 1 screw, and you couldn't walk in them. In comparison, clipless shoes are a vast improvement. But you can wear a touring shoe or Chuck Taylor's and do just fine with toeclips.
Clipless is lighter, or course, and it's easy to wear booties for winter riding. I don't get a speed difference, but my efforts are "sub-optimal"