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I've used these regularly over the past year. The difference is visible after first night. They stick well sometimes they slip off if I have a night sweat but they go back on. I'd say they lose stickiness after a couple of weeks but some last longer. I wash them every 3 wears and air dry them and they get sticky again. I have had a heat rash once so left them off for a week. I'd say they improve lines by 60% easily. I'm 51 and E cup. If that helps.
I sleep on my side every night so have three deep lines on my chest. These chest patches really work and have only used them for two nights so far. I wear overnight and have a lovely smooth chest in the morning ! The only unavoidable problem which I discovered last night is that if you get too hot it slides off but I removed it for a few minutes and then reapplied it and it worked fine.