Actually, I've had Legere Signatures warp. Not potato-chip waves all across the tip, but one or two mine have developed a single ripple. And they seem to be permanently set that way - they don't get better (or worse) if I play on them or leave them stored for a while. I always store them in a Rico (D'Addario) case, the kind with a black elastic band to hold each reed in place.I personally like the new Legere reed cases. Yeah these synthetic reeds never warp so I don't think keeping them on a flat surface is necessary. In fact I like these cases so much, I am using them for my Silverstein Alta Ambipoly reeds too.