Geocaching Australia

I am looking at upgrading to a PDA Microsoft CE based GPS and use OziExplorerCE as well as OziExplorer on a PC. Main use to be outback travel and geocaching with moving map in main towns a bonus. Pricewise it is simialr to the Garmin GSmap 76Cx so that is another option.

Has anyone used a Ique M4 and can give any commenst on how useful it is for Geocaching eg batttery life away form car and readability in bright sunlight.

Thanks
Gerry