Since there isn't a lot of information available because it's so new, I thought I'd post my thoughts on mine.
On ordering it... I didn't get to try before I bought, but I knew I wanted a double treadle and scotch tension, and I liked that it was portable so I took a chance.
There was very little assembly and I am very pleased with the feel of the wheel. I haven't stopped spinning yet! I really love the way the wheel looks and the way it spins. It's a joy to use.
I'll be happy to answer any questions anyone has about the Sonata if it helps to make a decision on it. (Whether it be for or against.)