Go here...
http://bc.whirlpool.net.au/
...and do some research. Everyone has their own opinion. Make up your own mind.
Also get your teminology correct. There is wireless internet and
wireless LAN...
Wireless internet is just that. Expensive, but total fredom to roam within
mobile phone service areas.
Wireless LAN is where your ADSL router is connected to wireless base
and lets you roam 50meters or so around your house.