I'm really pleased with how it's turned out - especially since I had to alter the pattern to stop it going all wavy. Instead of increasing on every row, after about the 12th round, I only increased every second row and that was much better. In fact, if I ever make another round blankie, I might start the alternate row increasing even earlier as the inside circles are still wavy.
Oh well, since it's not for anything more special than keeping me cosy in these yucky winter days, I'm not going to worry about wavy insides! :o)