I have had the hybrid for over a year and so far have not had any problems and the gas mileage is better than advertised if you take advantage of the car's mechanics. In a Long Island to NYC trip I will average 44 mpg and in highway driving at around 60-62 mph I can get 40 mpg (summer time). Accelerating smoothly to 40 mph and then letting the electric motor coast you at 39-40 mph on electric only in afternoon traffic works really well. Putting the cruise control on also improves mileage at highway speeds. But if you need acceleration it is available.
Being able to drive on electric only by gauging the stop and go traffic ahead and then recharging the unit as traffic gets past 40 mph. And then seeing 44 mpg on the electronic readout.
Putting the battery packs on the sides of the trunk or in the floor to give you at least one fold down seat to carry longer items. But has not been a problem so far.