We're very, very impressed. With a little self control the mileage really is as Honda advertised it. The way it handles is extremely impressive for a smaller car; we feel as safe in it as we do in our old work horse - the Volvo Cross Country!
Gas mileage, of course. The ability to manage that mileage by watching the result of braking or acceleration in real time is lots of fun - and practical - generally great cockpit!
Trunk space is about our only issue. Around town it's no problem, but going on a trip of any length we'd have to pack carefully.