I like the concept, but there were 2 drawbacks in my experience:

1. The backing was hard to release (get a fingernail under) without peeling the sticky away from the cardboard it's supposed to be stuck to
2. Some tend to come unstuck over time. I'm sure if I spent more time pressing the edges, they'd do better, but I was in a hurry to get my chips out of cardboard paper towel and toilet paper tubes!

Most are hanging in there and I wouldn't be opposed to buying them again, but I would love to find some that have some kind of small "tab" to grab and pull to peel off the backing. And something with stronger sticky stuff that doesn't require babysitting to get it to seal/set properly.