I just received the unit and have been testing it. The setup was fairly easy and the learning curve was not too steep but there certainly is one. It functions as advertised, spitting out tracking information at intervals you set and permitting them to be loaded to a website that can be share with others. The texting functions when out of cell range also work as advertised. I have not tested the SOS functions for obvious reasons but suspect they work as well. The best feature is its ability to be paired with a smart phone and operated from the smart phone. It is almost impossible to operate the unit itself using its own keyboard. It reminds me of the first cell phones. Also, much to my surprise, it is fairly sensitive to needing an open view of the sky to keep its gps signal. I have not tried it under my hardtop but it does not work in my car or in my office. Thus, I intend to buy a portable mount for it so I can set it and forget it. I chose an annual plan that cost about $300 a year. There are monthly plans but I am too lazy to have to plan ahead and might want to use it for other, out of season, trips. All in all, I view this as a device entirely for the benefit of others, not the user, to be able to stay in touch and know where you are at all times, with one big exception. There is no way to put a price on the SOS function. I hope I never have to.