I wish I was getting 33 mpg. I get about 25 but as you say that probably has more to do with the right wrist than anything. DavidHiya Ironhorse!
Safety?? It's probably just me, but I never bought any bike while thinking about safety... Now FREEDOM is another issue!
Seriously though... These things are stable, forgiving and consistent...kinda like a good spouse!
Drawbacks? The fuel mileage ain't the best... I get around 33mopg with mine and that seems to be a pretty decent number... although your right wrist will have more to say about it than anything else!
You'll have to get used to smiling a lot and answering quesuitons for curious folks who just want to know more about them... Just about every ride my Missus and I spend some time visiting with onlookers and making new friends.
In short; these things are just cool!