but I am 
Are you part Mercury developer team or associated with their team in any way?Some people here are allergic to Newbie members, so I think that some small explanation would be nice.
Fees are paid on withdrawal (either cooperatively or via backup tx). Currently 0.5% of the coin value. We think this is competitive with other privacy/coinjoin/mixing services.
There are mixing services that don't charge any fees, and I think that you should consider lowering your fees during beta phase and increase them later.I would also like to see some code audit and reviews from other security experts.
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Hey, one suggestion for future, please try to write your answers in one post, not in multiple consecutive posts (that is against forum rules).Thanks in advance.