I love the wonder clips as well. I have bought 3 boxes of them. I use them on binding and gave one each to DH and DS for holding their earbuds while exercising.
I also bought 2 packs of the jumbo ones, but haven't had a chance to use them yet.
I used to use the metal ones, but always hated having to make sure they were grabbing the fabric well, plus have to "snap" them shut after removing them.