Not a scam, but most would say they are over priced for what they deliver.
They are just like Salehoo, a wholesale/dropship directory.
I can't comment on their links as I am not a member, however you will find members here who are, and that will be in a much better position to comment.
You will also find quite a bit written about them in the forum here, and that should give you some insight.
Cheers