I really liked the Coluzzle, which was unfortunately discontinued. I never had much success with the Fiskars cutter, but the Curvy Cutter and Circle Scissor Pro have been very good to me. I ended up going with the Circle Scissor Pro because it takes up a lot less space in my tiny apartment. Just make sure you research the best type of cutting surface for your tool since that makes all the difference. Many of them work best with a glass mat.