I have the tracker (triumph branded) on my 900 with the fob.
It's great, no issues at all, and the point of the fob is that if the bike moves without it close by (so if someone pushes your bike whilst the fob isnt close by you will get a text alert).
Great system, havent had any issues with it at all other than the odd false alarm (like removing the battery before putting it in 'garage mode').
Feel free to ask any further questions. The fob stays on my keyring with my keys including bike key, no issue with that, you just shouldnt leave the fob on the bike if you are away from it. (so keep it on your keyring)
RBW.