I'm pleased with how square and flat it was, even after quilting. It rippled a bit on some of the binding. Blocking it has managed flatten it out (although I may need to hit the bottom bulge again). This will look great on the wall!
It ended up with twice as much quilting than intended. The first half of the quilting was curved lines that flowed around the quilt. It made me think of the tide coming in on the flats on Cape Cod. However, once that was complete, the unquilted sections puffed out quite noticeably. I feared those section would sag as it hung on the wall. I quilted the remaining sections with long wavy lines and swirls going the other way. That's when the name Ebb and Flow popped into my head.
I was going to freemotion quilt the black stripes, as well. In the end I simply added a few lines with my walking foot.