At the Sheraton Suites in Tampa, my associate had a non-SPG tagged room and I had the shiny SPG Room plaque on my front door. The only thing that I could tell was differernt was
a)bathrobe (which i never use, anywhere)
b) free water
c) cordless phone
I was still left with plastic cups for water and coffee.

Incidentally, this property looks like an old Embassy Suites that got converted to a Sheraton. Which is odd, because there is ACTUAL Embassy Suites about a half mile away.