To answer the question you're asking, I trust that the _device_ is basically never going to fail because it's FDA approved and manufactured by Medtronic, who ha

To answer the question you're asking, I trust that the _device_ is basically never going to fail because it's FDA approved and manufactured by Medtronic, who has a loooot on the line to make their devices fail-safe. To answer the question I _think_ you're getting at... I trust the open source software that runs the FDA approved device because it's designed in such a way as to be as careful as possible (temp basals vs boluses). It's also open source and a lot of people contribute to it. I also only update it once a year or so when my Apple Developer certificate needs renewal. All of that ^ helps, but honestly, it's not a guarantee. I still wear an off the shelf, FDA approved CGM with their native 1st party app installed so I still get their alerts on low/high blood sugar. To me, it's a calculated risk and one that (so far) has been extremely worth it. My A1C went from ~7.5 to ~5.6 after using it.