I was a sucker for those when I first started scrapping and bought a bunch of them. I still use the deckle edge pair but the others just sit unused in a box. I was thinking they should be dumped in order to open up some valuable storage space. However, I recently noticed in a couple of magazines that they are being used on elements for cards. Maybe I will give them one more try before getting rid of them.
I'm down to six pairs now - I bought a bunch a few years ago when Michael's had them for 50 cents apiece. Two scallops, a wavy edge, a small zig-zag, and two different deckle-edges. The deckle edges are pretty much the only ones I use, and usually only the smaller one - though now that I've figured out how to cut in a straight line with them I might give them another go.
And I agree with kelseymel, the product link really helped. Without it I would have thought you meant those metal strips by Fiskars that you hold against the paper and pull the paper up to tear it in a pattern. I didn't realize that was the name Fiskars actually used for their scissors (mine are pretty much all Provo Craft).
Believe it or not I still do use some of mine, quite often. I do not use them for creating layouts or cards though. I use them when creating mixed media pieces and cutting down some of the pp or papers. It really doesn't matter what kind of scissors that I use when cutting down the background papers, but I like to use the deco edged ones for some texture.