Saved a cat stuck in a tree
We bought 3 tracking collars for our kittens when they were ready to go outside, due to our autistic son being very nervous about them leaving the house. They work well and any problems have been quickly dealt with by support - I have had replies at all hours and on weekends.
One morning I went out to find our most adventurous cat as he hadn't returned as he usually would. Thank goodness for the tracker as I was able to find him on a neighbouring farm stuck high up a tree. I would never have found him without the collar - so thank you Pettracer!
Only slight downsides are I find the app a bit unintuitive and once or twice it has not worked for a short period (blank screen, unable to log in) but these resolved themselves, and compared to being able to rescue a cat, they are small fry!