It's a great service!Used it and gave my excellent detail and location including speed of travel, current and past locations, and battery levels. It's small and discreet and doesn't make noise. Their cheapest membership gives you updated location every minute and you pay more for updates every 30 seconds then 5 seconds I believe but every minute works quite well!! Another thing I liked is that it gives you an option to notify you via text or email the moment the person moves or leaves a specified area.FYI though the geo fencing is not customizable to the extend of a rectangular area or certain shape; it is only an area of a circle which grows bigger on all sides. This can be a problem because you may only want the area to be from 10 miles East and West but this also gives them a buffer to travel 10 miles North and South, problem depending how you use it.There are a few lapse moments where the location was off by a block but overall it works very well and corrected itself the next time it updated so you could see and weed out which location report was inaccurate. Happened about once a week or so for half hour at a time