Details of the Membership plugin

[Sorry - nothing to do with contact forms but there wasn't a simple Membership entry in the dropdown!]

Three questions about the membership plugin, which appears to be very comprehensive.

1) Are members the same as users? In an initial installation (no members yet) the one ID turned up both in the standard Users list and the Members list.

2) Presumably both members and users (if they are different) are not the same as Subscribers as per the standard Subscribe2 plugin. Or is there a better and more integrated Subscribe plugin that could be used? Even as part of the Membership plugin?

3) Is it possible to migrate members from level to level automatically? Could this be done by a cron job looking at the table {prefix_}m_membership_relationships? Or is there a better way to drip-feed members with posts every month or something like that?