From my understanding, you have to go to their website to request an invite, and I made such an invitation request about a week ago.
However, I have received No invite from them, so far.
I would also be curious whether anyone has used their service(s) to purchase and/or sell bitcoin, yet.
I'm wondering the same thing. I'm just guessing, but the thought occurred to me that they might be waiting for some regulation that might be coming soon before sending out the invites.
They said that they were going to try to moderate their growth rate; however, I have NOT heard any specifics about any normal person actually using it, yet.. or anybody else for that matter (referring to non-normal peeps).