I park every day next to a Prius at work. We both say the same thing as we walk out to our cars - "I am glad I am driving what I drive". LOL!
My car is a 2005 Vette. Drives like a dream, but he gets better gas mileage. (I think I got the better end of the deal) :-)
And you'll know for SURE you got the better deal when it's time for him to replace his batteries!
Ask him sometime how many miles he'll have to put on his silly little contraption before the gas savings pays for the cost premium he paid for it.
Hint: current estimates are over 100,000 miles, WITHOUT considering the cost of replacement batteries.