I swear you just made me feel so old. I mean, I haven't used cash in a while myself, but didn't even think about being able to skip checking in at the hotel lobby.
As far as S&S Card or Wrist Band, I personally like the card better. I know someone else mentioned it, but I'm so used to wearing lanyards, that I'd be less like to forget my card when it's on a lanyard. I can't count how many times a week I forget to put on a watch.