I am considering purchasing a Spot Gen3 Messenger. My main purpose is to provide peace of mind for family at home and so they can track my progress. I would have to be in very serious trouble before I would consider making a distress call. Any advice or opinions about if it delivers as advertised? I've read mixed reviews on retailer sites, some love it and some think it's a rip-off, especially citing problems with the subscription service. Any input welcome, thanks.