I have had one since Christmas 2010 and used it literally around the world, lately in Thailand and Korea. The tracking feature works great in the outdoors but once you get into an urban area with many tall building that block the skyline it is hard for it to get satellite reception. The battery life it excellent, construction sturdy and it is waterproof. Recently I upgraded my service to have help button (hands) call a tow truck, instead of family/friends, because I do a lot of off-roading in the desert where cell phone reception is hard to come by. Thus far I have been happy with the product and have no complaints. That said, I have not have had the need to try the SOS or Tow truck feature and (knock on wood) I hope I will never need it. All in all it is great for peace of mind not only for myself but also for my family to know where I am when I travel around the world or to middle of nowhere desert.
Here is a photo of my wifey as we travel through Thailand and the reason why I ended up getting the spot – rolled my jeep…
More about the Spot:
SOS: Use this function In the event of a life threatening or other critical emergency to notify emergency services of your GPS location and that you need assistance. The GEOS International Emergency Response Center alerts the appropriate agencies worldwide – for example contacting 9-1-1 responders in North America and 1-1-2 responders in Europe.
Help: In the event of a non-life threatening emergency, you can use this function to notify your personal contacts that you need assistance. Additional SPOT Assist services can be purchased and programmed to your Help button as well. When activated with SPOT Assist, the Help button will notify professional services either on the land or water. SPOT has partnered with national service providers to offer non-life threatening assistance.
Check-in/OK: This feature allows you to let your friends and family know that all is OK with a pre-programmed message along with your GPS location. With a push of a button a message is sent via email or SMS to up to 10 pre-determined contacts and your waypoint is stored in your SPOT account for later reference. Your stored waypoints can be easily integrated into a SPOT Shared Page or SPOT Adventure account.
Custom Message: This feature allows you to let your friends and family now receive a custom message along with your GPS location with a push of a button. Use this feature as a secondary OK message or transfer your personal help alert to this message function if you are using a SPOT Assist service on your Help button.
Track Progress: This feature allows you to send and save your location and allow contacts to track your progress in near real time using Google Maps. With your SPOT account you have the ability to set up a SPOT Shared Page which allows you to show your SPOT GPS locations to others on a Google Map.
More information at: http://findmespot.com/en/index.php?cid=102