not a bad idea IMO. on the way out to europe, all my mates got stopped and asked what they were going for etc. but i just went through straight away, no questions or looks. its a good as you it will be linked to a central database, amking it harder to fake passports. its not like they are monitoring everything you do at all times... if you had to keep it on you at all times, and they monitored where you went, then it would be bad, but this aint exactly big brother now is it...