Glad I found this discussion; I just started back riding after not getting on one for about 8 years. I just ordered a 36 inch one yesterday. Can't wait to get that one.
Back in the late 80's I learned how to juggle on a uni. From the time I started til the time I got to where I was comfortable enough to do torches it took nine months to learn. Now I am struggling with it; but it should come back pretty quick.
One thing I have noticed is that riding a uni doesn't affect my BG nearly as bad as riding my bike.
Just rode in the Saratoga Tour de Cure on June 2. I'm old and pretty out of shape so I rode in the last group of 10 milers. There was an entire team of unicylists and one Penny Farthing bike in that group. No red jerseys though.
I started riding a 26" muni back in October -- hopefully in a 6-18 months I'll be good enough to get into Unicross :)