I have been doing a little research on these and there are certainly some advantages to using it but the one major drawback I see is that I would have to buy more holders and from what I have seen that means buying the back that comes with it. That's all fine and dandy if I use it on my 'cord but if I buy several sets that means I have to buy more Rollei's to fit them to. It's the old "we-got-new-curtains-now-we-need-new-furniture-to-go-with-them-but-now-the-carpet-doesn't-match-the-new-furniture-now-we-need-new-curtains" syndrome. It's a vicious cycle that just keeps on going. I'm thinking about keeping them but is there any way to replace the old felt?