Bitcoin has a grave disadvantage - any transaction can be tracked down through blockchain. A Bitcoin mixer's job is to mix clients' coins in a way that makes the tracking if not infeasible then horribly difficult and time-consuming. A classical Bitcoin tumbler, however, can be very ineffective in this respect as it basically accepts coins with any history and can end up passing this dangerous money over from one client to another.
As opposed to this type of mixing services, we have an integrated cleansing feature in the "Complete anonymity" mode. This functionality initiates a mixing procedure that results in your receiving verified coins with clean track record from major stock exchanges.