I picked up the smaller brother of it the Oregon 200.
First update to the latest firmware, the older firmware are a bit problematic.
I put in a 16 GB MicroSD which gives infinity space for maps.
But for recommendations on Maps....tell which countries you are interested. If you use it in USA you'll look for different maps than if you use it in Russia......
I could not figure out which maps support 3 D view. I installed the Austrian Topo v2 but can't activate 3D view.....Would like to try this feature. Or maybe I do something wrong.