Alternative solution to Garmin Zumo
The device uses iGo software, developed by a Hungarian company Nav'n'Go.
I use the same sw in my PDA system and like it very much!
The only drawback for me compared to the Garmin systems is that you cannot plan your route on a PC or Mac and when finished upload to the unit. Also you can store only one route at a time. Meaning you cannot open already planned routes as it is not possible to store routes, they are deleted after you plan a new one.
Otherwise the user interface is very user friendly and fast.
Regarding the hw I have no experiences.