User blog comment:GhostsSpector/How does Brick Link work?/@comment-5671588-20130507144106

Trustworthy: It depends on the seller. I have never had a bad interaction with a seller on Bricklink personally. I would say that it's very hard to find an un-trustworthy seller. And you can always report users who do not provide satisfactory transactions.

As for shipping, almost every seller has different shipping costs, so read carefully what they say about shipping so that you know what you are paying.