I recently bought one of these from Chinavision after reading the views on this forum and I have to say, it's awesome!!!
I loaded igoPrimo onto it as it came with no software then put NZ/AUS maps on it no worries....the POI's on the maps I used don't work too well, but I can live with that.
If anyone needs a hand with info about how to do all this, let me know and I'll see if I can be of assistance.
is a decent site to use to create your maps as it recognizes forest trails and the such from all over the world, I then save the file as a kml, then import it into google maps to add waypoints that the GPS can follow. May seem a long way around of doing it, but seems to be one of the only ways of putting forest trails and the like on the maps I use...
End of the day, it is a great/cheap unit that should work for long enough!!