Oh, now I feel a bit guilty for not checking out the FAQ first >.<
Thanks for the quick response though! I'm guessing I'll just have to find my way around it. I've seen some threads about PayPal previously before, but I was just wondering if a change had been implemented since then.
You only get access to the latest unreleased volumes as a member. Once they're published, you will lose regular access to them. The part 1 previews for each volume are all that stays up otherwise. Premium member gives you one credit a month to purchase a volume of your choice.
There are also two series on catch-up every month. I forget what we have this month.