What's the history on these credits? If they're from this year, then Nesba will take 15% first and the expiration date will not change. If they're from last year, then I think they'll transfer as stated.
With the expiration in the beginning of 2012, would you be willing to part these credits out, I don't think I would even be able to use that many by the end of the year.
But I just bought all the credits today. I may part with some but as of right now I have my eye on 5 dates. I guess I'll also use some to reboot my membership. Once everything transfers I'll set up all my dates, pay membership an see where I'm at from there.