I have the 60 and several 45, left handed versions. I love them. There is a learning curve to cut accurately, how you place your pointer finger gives you leverage and guides the blade. They do (when new blade is used) cut very thick piles of fabric. As Carla mentioned above, accuracy is sacrificed when cutting thick piles of fabric. If you are just slicing and dicing for scrap quilts, no particular size, you can cut through great piles and make quick work. Eight layers is NO PROBLEM for these cutters, but again, watch the videos for proper use and you will love them too. No pain in my wrists after several hours of cutting. I also have their large mat, and using the combo makes cutting a breeze. The blades do last longer with the mat. I have even used Harbor Freight (Oh horrors!!) blades with better results with the mat. The cutter itself is great, the blades are great, the mat is great.