Anyone got a stable GPS tracker working?

I heard about Spybike but it seems struggle after a while. There is a copy of headtube version from China for half price.

BikeSpike and Locca look as more proper alternatives though they use external bodies mounted on frame and takes monthly payment for SIM service.

List of various trackers

http://postscapes.com/gps-bike-tracker

I have no idea which would be good choice. Maybe a chinese one that I need learn programming to get gps unit to work.

This was discussed acouple of days ago and the feeling amongst those /us using gps tracking for work was that it’s not going to be much use as bike security