Here in S.A. you cant have them and they are sold for "Offroad use only" as in Not on the road / display type purposes. although they are probably quite safe to use, i'd suggest against using them.
They give the police a reason to inspect your car and upon inspection they might find something else you have modified that they can defect you for. Like sports peddles, non-ADR aftermarket steering wheel (non-calapsable boss kit), Guages above the dash line, Loud exhaust, too low suspension, too big wheels, tyre wear, oil leaks, the list goes on.
i realise that it's not guaranteed that these things will be scrutinised, but i previously worked for an autObarn store for about 9 years and you would be amazed by the things that have got people in trouble.
Most modifications can be deemed as defectable. the argument is that it's not standard, therefore hasnt been fully tested.
But in the end, it's up to you.
P.S Rescue, you are right, TIN stands for Traffic Infringement Notice.