We have had a 2003 Prius in our fleet bought new. We bought one because we wished to make a "statement" and a contribution to the hybrid effort.
Quite a number of different drivers, but very good maintenance. We get high 30's in winter and high 40's in summer. I am not aware of reports of milege in the 50's. For running around on flat ground and for city driving it is fine.....where a small car makes sense. For travel over mountain passes, etc. it leaves a lot to be desired in terms of performance...even compared to similar small vehicles.
But hey.....it's a start.....these vehicles will undoubtedly get better and better.