Looked at this for a while and bought one at this price. SuperGrip Tools have dropped the price to $179 with free delivery. Have bought a number of Hitachi items from them and have been very happy with their customer service. This unit suits the Slide type battery series BSL18xx.
Good thing about these 1/2 impact wrenches is that you can get an adaptor to turn them into a 1/4 hex impact driver that fits all your 1/4 hex bits as well. This means you essentially have 2 tools for the price of one.
http://ryobi.com.au/universal-impact-driver-adapter-square-h…
Bunnings sell that one although the link to their page is not working. Don't know if Supergriptools sell them as I had one.
Because this Hitachi model has 4 different speed settings as well as 2 different impact settings it covers a wide range of jobs. I've driven small screws into plastic with a PH2 on low setting and done up largish wheel nuts on high setting. As long as you first break the nut when taking off and give it the last tighten manually when putting on it works great.
3 Year warranty from Hitachi is standard. Very happy with the purchase so hope the above info/deal is useful.
*Batteries not included