A Suzuki Aerio? I'm glad you like it...but it looks like it got whacked by the ugly stick to me. Same mileage as a Matrix? Are you sure you didn't have any corpses in the trunk? The Matrix should get way better mileage with a 1.8. As for visibility, you must be short. I have no problems in my Vibe, although I'm 6'5". (rear 3/4 view is a little squished I admit). As for the sound system, I can adjust the sound to different levels and always find good sound.
Curious, but glad you like your Aerio.
Yep, quite happy with the Aerio. Yeah, it's looks a bit dorky, but that's OK (I'm a bit dorky, too).
Mechanically, the Aerio has been very reliable, except for the front wheel bearings, both of which have had to be replaced. (This is a known problem with Aerios.)
My impression with mileage (not scientific by any means) is that the milegae is as good - if not better - with the Aerio. And I'm tall (at least 6'3").
I was in a 2003, so over the years I'm sure they've improved the Matrix. My Dad bought a 2007 automatic after selling me his manual and he said that it was peppier than the manual.
My must say, however, that my personal preference at this point is for Suzukis and not Toyotas. Stylistically, I just don't like them...