I had some on a Team Marin I bought, they were very old and tatty looking but I liked them so much I transferred them to my daily rider. They did eventually fall apart but I still like them so much I bought a new pair.
In my opinion they are better than traditional clips, the only drawback that I found was you have to wear similar shaped shoes every time you ride the bike, the one time I tried to wear my work boots my feet wouldn't fit and they were only marginally chunkier than my usual trainers.