Excellent clippers, brilliant selection of blades BUT I find changing those blades very, very difficult. I know how to do it and follow all the instructions. Opening to remove the blade, I always feel I will break it, its so stiff, but as for closing once I’ve put put a blade back on..........that is tortuous and can take ages to get it positioned just right (yes I do run it to get the little white bit into place) Eventually it suddenly clicks in, unfortunately by this time I am thoroughly annoyed and whichever of my dogs I happen to be trimming at the time has got really fed up and made a very determined escape attempt, often successful. I have two Mini Schnauzers and a Bichon