I seem to lack adequate coordination and/or flexibility to apply the overpatch to the back of my arm without getting a wrinkle or two that I can’t seem to get out. Of course it could be my wrinkled skin as well. LOL Otherwise it seems to be a great product. Has lasted the full life of the sensor and no irritation to my sensitive skin. My coworkers are always asking “What does your patch look like now?” Thanks to stick2hope I can always keep them guessing.