Hi, not sure if it is still relevant for you. I have Pit Pat for 4 years on my WHD. My experience is good with it, the service is excellent. I had one issue with them (charging was NOK), they tested remote the unit, found the issue, sent a new one and restarted the guarantee w/o even asking them for it.
on the practical side, it needs a bit of a time to contact wit the unit but after that works well as long es you have mobile service in the area.
as a regular traveler to Europe, I can confirm that it works there w/o issue and no extra cost (as long as your mobile has rooming).
tracking: I belive nwo you can pay for monthly service (normal search& find service is free) to see the waling track and save it
If you have q, let me know if I can help.