After reading all 5 pages on this thread, I would like to clear up the following:

1) the cert is valid for 24 months after issuance
2) You can use the cert even if you an award ticket on BA metal. So, if I book ONE award ticket thru miles, then I can get the second ticket via this voucher provided there is space availabe.

Of course, paying all the taxes and fees associated.

Pls clarify.