I have the RAM cradle, with the handle bar mount and 'clamp' arm. Works well.
One limitation with this unit over a GPSmap CSX I have found is that you can have 2 map sets loaded, the basemap, and one other (which is the same as with other units) but what is different, is that you can't deselect/select individual tiles (overlapping tiles) in the Rino, which you can do in the GPS Map series of units.
I have loaded Shonky maps with the base Global map, and that is fine for my purposes. Alternately I could load Garmin City as a base map, and Shonky or Garmin Topo as the alternate map set and select both or either of these maps at any one time.