I have been using my 4.5 lb molds for a few months now and they have served me well. When I received my order the liners and mold were not the same size so I had issues with my first loaves where the loaves were not square, they bowed the closer to the middle. I reached out to Customer Service, provided some pictures of the molds/liners and the soap. They resolved my issue and provided me with the correct size mold/liner and I was well on my way! These molds have served as my "work horse" molds since I got them and they have definitely held up to the constant use. The liners are high quality, they don't need any adhesive to keep them up in the mold and soap releases like a dream. If you are on the fence about getting these, get them! There is a reason they are sell out so often, they are worth every penny.