IMO, it would be stupid to pay money for CBS All Access for this because I honestly believe that the show is going to flop on that platform. After the first season they will probably just put the show on Netflix (for America).
And when that happens you cancel CBSAA.
I suppose the quesiton is when do you want to watch it. At some point in 20 years time you'll be able to pick up the dvds for a bargain. I've done that with game of thrones - wait for it to have finished broadcasting, then buy the whole 8ish seasons for £100, and watch them in order.