tracker seem to be a victim of their own success at the moment, i had a lot of trouble getting the unit fitted to my caravan activated after i asked tracker to check the unit was working one year after purchase and they claimed they had not received the paperwork, i had owned the van for a full year with no protection since it had not been activated.
I also have a friend who had a tracker unit fitted to his transit van on a lifetime agreement, he was contacted recently by tracker to do a check on the vehicles whereabouts as the tracker was now 5 years old and somebody else had requested a tracker to be fitted to the van, he had in fact told them 3 years earlier that he had sold the vehicle and the tracker should be de activated, obviously they did not carry this request out.
On another note i recently purchased a ford transit van and decided that i needed a tracking system fitting to it, after lots of research i decided to go for a gps / gsm based system that i could monitor myself, i purchased one of these units and took my van in to the dealer to have it fitted. the dealer rang me to tell me had found that the van was already tracked by a company called "remote asset management" and he could not remove their equipment without authority. i contacted this company and they agreed i could remove the equipment but only after they had checked that i was now the legal owner, they had details of every journey i had made since i purchased the vehicle, i am told that the vehicle was limited to a 100 mile radius of manchester and if i had gone out of this area the tracker would have alerted them to an "illegal movement", that would have been fun as i intend to use the van to go to france every 6 weeks. ive now had their equipment removed and my own fitted. my tracker is a really good unit from what ive seen up to now, it texts me every time the van is started and tells me its location, i can auto track it on google earth and i can dial in to it and listen to any audio and voices within the van if the van is stolen. great piece of kit with no yearly subscriptions just keep the pay as you go sim topped up, ive put around 2000 texts on to make sure it never runs out if stolen.