I've found the integrated trackers website myself when looking for a tracker yesterday. I see 6 issues with it from my research:
1) their website has not been updated for 2 years - makes me worry about their continued existence
2) I can't find many recent reviews - see point 1
3) the headset tracker replaces the headset bolt and is made of plastic which someone has reviewed as having cracked due to the inability to tighten sufficiently to hold the bike together correctly.
4) the headset tracker is currently out of stock with no indication of when it will be available
5) the lamp tracker can be easily removed
6) the seatpost tracker has not yet been released, but it replaces the existing seatpost and is therefore not suitable for anyone who is enjoying the benefits of a nice suspension seatpost.
The cheap ebay trackers may work well - but do they work reliably, and can the be made to fit inside the bike somewhere hidden - e.g. in the handle bars where no one would expect it.
From what I see, a tracker needs to be:
a) reliable (so it you can be certain it will be transmitting of your bike is pinched)
b) discrete (so a theif won't see it and remove it)
c) long battery life - or able to charge a battery for it from the ebike battery, so it will allow tracking for 1-2 weeks after a theft.
d) small - see point b
Still looking and thinking.
What do you have Wander and where have you put it?