Alarms / Disc locks

[NINJA]

Hi All -

I have been looking at the Oxford Boss range of disc locks/alarms and am wondering if;

A. They are the best?

B. Are they the most secure?

C. Offer the best value for money?

Based on your experiences what are you guys using and which one would you recommend?

Thanks

[Calum]

I use the Xena Disc Lock Alarm

Is pretty good.