I had Trackstar by Telestar Navman on my Plus 8, which worked perfectly for 6 years. I have MetaTrak on the Alfa which is a cheaper system only slight niggle is the system comes with a keyfob which you have to have on you when driving.
Just a warning with Telestar Navman if you sell the car or stop the annual subscription there is no refund but as the nice lady said to me they will not charge me again to reinstate the remainder of my 5 year (4 years 7 months) subscription on another car at anytime in the future....
I fitted a tracking system on the Plus 8 to reduce the insurance premium, when first done it more than halved the premium.
