Back several years ago when I was doing my research on the Delorme InReach vs Spot, it was a no brainer for me. The overwhelming majority of reviews / posts were negative about the reliability of the Spot and the satellite system that Spot uses. I bought the Delorme InReach SE and have never had an issue with messages not going through or being slow. Many times I will get a reply to a message within 5-10 minutes.