I'm on Buddypress (awful) and would like to import users AND discussions/comments. Is this possible?? (I know we can import user accounts)

There are couple of options to do this. @Jeff Molander 

1. You can hire someone to use Tribe's API to import your current content and users to the platform and then setup Wordpress SSO to let users login seamlessly without the need to setup a new account. 
2. You can contact Tribe's sales team. We offer migration services to premium and enterprise clients.
3. If there are not so many content and you think the community can be built from scratch, just invite users to your Tribe by going to the Admin panel > Members > Invitations