buddypress basics

i used wordpress but never touched buddypress, after a look @ their site it provides a community type site.

wpmu does something similar and with a couple plugins from you guys like friends, user msg, community etc i can set up a site with interaction.

does buddypress just do it sexier?

if so buddpress can be added to wpmu? is it just the buddypress theme and buddypress plugins that i only turn on for the buddypress site?

users from the super admin site will carry over to buddypress?