Following up on this - I purchased the subscription online yesterday and the benefits were immediately available to me.
I bought the international version for me and up to 8 others on the same reservation - cost $1099. To move myself, DW, DD to exit row on our coming BOS-SNA trip would have been just under $1200. I know I will benefit from the subscription on our Aruba trip next spring, at the very least. So it was a good deal for me.