Always remember...they have an 'off' button.
You CAN be their master, not their slave.
They are invaluable to 'have'...even if not 'used'.
One occasion I was moments from a '000' call...[911]....because I came across an unconscious teen in 40 deg C heat.....and another I DID use it...[000] when I came across 4 big boxes on a freeway which were an accident waiting to happen....[a taxi hit one...and a semi almost jack-knifed at 100km trying to avoid them and the cars]...but we got them off after calling for police support.
Like I said...invaluable...
I'm in the building game...and that, along with Australia's propensity for rapid uptake of new technology...[we tend to have the highest per-capita use of all sorts of new products...be it Mobile [cell] phones or DVDs, etc...]...so I actually commented today I was waiting to see a building tradesman who DIDN'T have one.
They are as common as mud....I have 4 of them myself......