I started using the Freestyle Libre 2 about 2 months ago. 4 out of the 5 sensors I've used have not lasted the 14 days and I get an error message telling me to replace the sensor. Sometimes after only a few days, one time after a few hours. Each time, I have called the support line as suggested by my doctor, to request a replacement. Each time I've called, I have had to spend more than 15 minutes on the phone being asked a zillion questions before they will replace the sensor. A huge waste of my time. I can see if this only happened occasionally but as I said 4 out of the 5 I've used have had problems with. Oh, and they require that I return the defective sensor to them. They send me a return kit but I have to take up more of my time to package it and drop it at the post office. Maybe I just got a bad batch, but so far I'm not impressed by the product or the hoops they make you jump through to replace the defective sensor. Unfortunately, this is the only continued glucose monitoring system my health insurance covers so I'm stuck using it unless I want to come out of pocket for another brand.