Bought a Hema HN7 a few months ago, wish we had got it sooner the 150K map is great especially good in the country driving between destinations, it displays upcoming rest areas and is really useful when travelling and you just want a quick stop or know which road is ahead. The 150K scale is also good in national parks as it displays most roads and campgrounds.
The city GPS only comes with 2 years of free updates which is poor compared to Garmin's lifetime free updates. Also if you want updates you need to have access to a Windows PC and also need Windows to load Ozexplorer maps, this is a big disadvantage for us as we only use Apple hardware and software and have no other need for Windows software. Though Hema will do updates for a fee at their business, it is a real shame you cannot update via Apple software as our Garmin does.The city GPS is similar to our Garmin which it replaced and is useful around places like Sydney, but once out of town we mostly use the 4WD 150K map.
We got ours from Mapworld and included the sun screen which is really essential if you put it up on the dash fixed to the windscreen. The 100k topo map option is also really good, for when you want more detail. In our (mine and the navigators) opinion 100K is not as good as the 150K for driving along between stops, but great once you get there and want to do day trips, etc. One trap for new users is that the Camps 8 option only works on the city GPS and is not accessible in the 4WD map mode.
A very useful feature is that the HN7 come preloaded with the entire Hema map collection, these maps are great. We have used the paper version for years and in when you are in an area covered by the special Hema maps it is worth changing the display from the 150K or 100K to look at the Hema map. These special Hema maps alone are almost a reason for getting the HN7.
https://www.mapworld.com.au/products/hema-navigator-hn7-free-sunvisor?variant=3566142785
On special at the moment with all of Australian 100K maps at $629 is cheaper than we paid.
Overall the HN7 is great for travelling in 4WD mode and the city GPS works OK. There are a few issues, but are minor compared to how useful it is when you are in the bush.
Regards
Terry
PS If you mount it on the Windscreen we found vibration can be a problem on dirt roads, a bit of foam stuck under the HN7 screen and the HN7 screen resting on the foam on the dash gets rid of a lot of the vibration and makes it much more readable.
I don't have the link any longer. You will also need a larger sd card than the supplied 8gb.