I am using wp-members with BuddyPress but have not integrated the profile fields with the wp-members form (not sure if this is possible anyway). The problem is that wp-members allows users to put spaces in their usernames on registration. This causes problems with BuddyPress which isn't designed to handle spaces. For example, it is impossible to send a PM to someone with a space or spaces in their username.
Would it possible to add an option in the admin to block people from registering with spaces in their usernames?
Unrelated, but is it possible to integrate BuddyPress profile fields with the registration form?