The choice you make depends on your budget basically.
I own a Mirage as my second car. Auto full spec (not the sport version).
Fuel consumption is superb.
Some people bashed this car for its build and material quality, fit and finish etc. but in my opinion they are good. I think better than Prius C.
Noise: Sound proofing is good. Most noise is coming from the CVT which is similar to other CVT car such as grand livina, proton preve. The sound proofing is better than my Honda Stream RN5.
Suspension: soft setup for comfort drive. Due to this, there is body roll during cornering. Note that this is an eco car, it is not meant to be drive fast. Handling is good.
CVT characteristic: Good pick-up when going uphill (in D).
Rubberband effect which is normal for all CVT -feel difficult to accelerate after slowed down (after high speed). I have drived Nissan X-gear, Preve... same character.
Comfortable seat: better than myvi.
Space: Mirage is not that small. Myvi looks bigger because of the big glass window and the square shape. Myvi is only slightly bigger. I think Mirage boot space design is better than Myvi.
Maintenance: Myvi; more frequent visit to Service center because have to service every 5000km. Mirage; service every 10000km. So save time and money. Note that time is more precious than money he he he.
I am a happy owner of Mirage, if you opted for Mirage please don't buy the Sport version. Not worth it. Just go for the Auto full spec only.

This post has been edited by DoomHammer: Aug 20 2013, 06:26 PM

Have not tested on my mirage yet but RON97 give me better mileage with my Honda Stream 2.0.
I don't feel like putting RON97 in my mirage because it is mainly used for town driving only.

One of the reason I bought Mirage