Bigger question is how does it compare to the Micra? They seem to compete more directly than any others, save for the Spark - but pricing-wise, it's dead on with the Micra.
I haven't driven either the Mirage or the Micra, but the Spark had enough power, surprisingly, and did return an unreal fuel economy figure.
...still, I felt so icky getting in/out of a micro-car, I'm not sure I would feel comfortable putting myself, my friends, or any potential children in it. Even if IIHS did rate it pretty well (except for the small-front overlap), it just doesn't feel substantial enough and if you option it to $17,000 pre-tax, then why get this over a Civic/Corolla? So much more car for so much less.
I agree, therefore, that the base models are the better deals (as is usually the case), but here it's really the only way to get this car.