Hmmm, I might have to break down and give them a try. I've been playing around with the portrait style for a little while and see how the spirals would be beneficial for them. OTOH, I still have plenty of practicing to do with the flat blade as I am far, far from perfect. I don't want to mess up the progress I've made along the flat blade learning curve (if I would). Have you tried using a flat blade since? Did the time you spent with with the spiral blade mess up your flat blade work any?
BTW, the kitten is great!