I was at the dealer to set up an appointment for this afternoon for a TCM reflash on my cruze, and I moseyed over to the showroom, they had a base sonic in there. I was very impressed with it. The seats were very cusy and comfortable. The interior is just=, a massive, massive improvement over the old aveo. It feels like it was actually put together by people rather than howler monkeys with wrenches.
The most surprising thing of all was that with the front seat in a position where I should sit in (at 5'11" tall), the backseat was completely livable. I wasn't sure about the motorycle style gauge cluster. But after seeing it in person, I'm fairly confident I could live with it, and like it. It's different, the speedo,odo, etc are large and easy to read. I prefer a digital speedo/analog tach anyway.
I didn't drive one, but at this point I can believe that it's fun to drive too. It's exterior size belies it's interior space, it just feels roomy in the front seat. Impressive.
The only thing I noticed that I didn't like was the lack of any real padding on the door armrest. But that's pretty minor considering the vast improvement. Also, the only subcompact made in the USA, even if that plant has had a few little hiccups. Either way, it's worth a look, I think.
By the way, this IS me being unbiased. I was slightly annoyed at my dealership at the time for giving me a somewhat hard time with not wanting to do a TCM reflash. They finally had to call GM to find out if it was okay to do it. And of course they did. In the end they agreed to do it, so down there I go today.
Seriously though, go look at the sonic, it will probably impress you. It sure impressed me.