While it's worth noting the offer here for all to see, it's probably best to direct discussion to one of the ongoing threads.

Please see the discussion in the United forum (which has reached 2 pages) and in the S.P.A.M. forum.

Also note that the offer appears to be targeted, so if you didn't receive the email you may not be eligible for the miles. However I haven't kept up with the latest understanding of this (as I did receive the email ) so you may want to read the threads I linked to above.

Regards,
Gary
aka gleff
MilesBuzz and Delta moderator