I have just completed my Delica Bracelet and secured the clasp. The magnetic strength of the clasp gives me peace of mind that the bracelet will not fall off my wrist. It is easy to sew on the bracelet , but you should take the time to do it properly and neatly. It will pay off in the end. I am not sure how the metal of the clasp reacts with skin, so I can not attest to it's longevity. I think it looks a very professional finish.