This is one coin you will want to have some of, it's not the same cookie cutter as 99% of the coins out there.
Invite system was terrible until POG 2 came out, now it is only slightly better. Still hard to get invites without buying them.
Agreed, the improvements they made to Proof of Growth are night and day. Invites are getting better, but I imagine the team will keep looking for ways to improve this too.