Mailchimp auto add with buddypress

Just to clarify, if what I’m after is having all emails that go through the signup form automatically added to my mailchimp list, the wpmu plugin will do it?

Note: I’m currently using buddypress, but not allowing blog signups, will this work with the setup described above?

I’m looking at this plugin:

http://bigtie.hfconcepts.com/

As an alternative if this isnt the case (any experience)?

A nice feature, but not required, would be to (a) allow a user to unsubscribe from within their profile, as well as (b) choosing MORE lists to add listed in their profile beyond my default one (hidden, mandatory until opt out).

Also looking at this,

http://subscribe2.wordpress.com/

but I’m a little weary of the development..