I LOVE this thing. I've used it 50-60 times so far and could not be more pleased with the results. It is important to center the crimp in the top holder. It DOES feel a little odd, you need to unlock it first, put the threaded crimp under the top holder and then squeeze. It does not give you the satisfying crunch you are used to from most crimpers and when you first use it you won't be sure it's working but take a look - it produces a beautiful crimp! I'm really surprised at the negative reviews. I've taken this to several beading gatherings and most of my beading buds have ordered one too!