Had a Thatcham 2-1 Upgrade alarm fitted to my gsi in july after it was broken into in may. Cost me nearly £600 because i had all the extras and backup's but its never worked quite right and when it goes off my god is it loud as i paid extra to have it trigger the horn constanly for 30secs. Has a tendancy to go off early hours and its really gettin me down now. Keeps goin bk to installers but keep having problems! I love the car but is it worth it?