Just got a couple today for the woods and irons, to check out whether I hit the sweet spot consistently enough, I've used the carbon paper stickers in the past, but they're too expensive to use on a regular basis.

Anyone tried these out?

Ive got some Jim and to be honest i didnt go much on them. You have to make sure you keep them dry. I think i used mine once and they havent left the cupboard since.