I have owned the SOSPENDERS for years. I bought my first set approximately 15 years ago. With the origional model, I had it inflate while in the garage only once and that was after wearing it all day in the rain. I have heard people telling stories of these inflating while fishing or running while in the rain, but I have never had this occur. I purchased a newer model a couple of years ago and have never had it inflate automatically. I try to remember to change out the tab and the cartrage every 2 years, if they have not inflated, just to be safe! I had a buddy fall out of the boat while wearing one and it worked perfectly. I do like the fact that they have the manual back-up just in case the auto would not work! I wear mine 100% of the time on the water, and have never had any issues!