The easy open 'squeeze me' mechanism works very well. You just squeeze the handles slightly together and the secateurs pop open ready to use in your hand. To lock the secateurs though is a little more fiddly. I think this is partly because at first I could not train my brain to lock them in a different way to my old pair. It is a different action and so I had to learn not to do what my hands just automatically wanted to do. I can just about do it with one hand now but quite often it takes me both hands to lock them. The lock works well though and that matters. A pair of secateurs popping open when you don't want them too is both annoying and a risk.
The secateurs have now become my primary pair. I am very pleased with them and I can happily recommend them.