Hi EasyRiderDud,
I'm just under 6 feet tall and never saw the height of the handlebars as any concern, and they sit today at the same height they were when the bike was delivered over a year ago.
The handlebars sit on a two section riser assembly that allows the upper section to be raised or lowered a few inches. I have no doubt they can be adjusted correctly for anyone riding the bike. You will probably discover that the handlebar height is not as much a concern as is the reach forward to grab the grips and operate all the buttons, levers, horns, and switches. First thing I noticed was the exaggerated lean forward that I learned on three previous RADs will put excessive weight on the hands and wrists and after a while will begin to cause sore and irritating pain in the hands and wrists. I now sit upright and that also helps keep my back from hurting since I'm not bent forward all the time.
Every one of my bikes were modified for seat and handlebars, including this step thru, which I found an easy fix to bring the bars closer without adding or making any major change to the steering.
Otherwise the RADMini has a lot to offer in the way of ease in riding and storage you don't get so readily in the other bikes. The center of gravity is low making it easy to hop on and ride and for overall ease in handling, and it has proven to work well whether riding city streets or on soft sand out in the SoCal Mojave Desert.
Happy bike hunting.