That's a great video, mel! I've been doing the sandwich for 20+ years, and it's always either paid off, or they return it. Glad you had such a good experience. Kind of ironic that "free room upgrade" came up as a next video choice at the end.
My.personal best was Borgata; I was comped in for 3 nights, and the sandwich moved me from a standard room to a 2 br corner suite. Didn't think to price it, though; just enjoyed the hell out of it.
I've had that exact room at the Cosmo twice; once as a terrace 1br, once as a Japanese sex room (different colors, mostly yellow, and condoms.in the minibar). Gotta love the 6 person shower with the glass wall fronting on the bed.
"If the house lost every hand, they wouldn't deal the game."