I think Sow will be DD eventually. After the intial release, Ubi allowed some distributors to sell 1946 through downloading. The copy of 1946 I fly right now is downloaded from
www.direct2drive.com and they still offer 1946 if I'm not mistaken. The best benefit to getting it that way is it is automatically a "no-CD" solution. I don't need a CD or DVD to play, just click the icon and away I go. I love it!!
So I think that SoW will go that way after a while.