Mixed feelings!
I had a business trip to New York recently and needed a hotel for one night. As an SPG member I decided to use points and chose to stay at The St Regis. 
On arrival and on check out the front desk staff were very courteous and professional, something I wasn't sure of given this was basically a "freebie". Even though this was a reward booking I was shown to a butler suite. I was attending a business dinner so had my shirt and suit pressed - which was complimentary. Unfortunately they were late back which meant that I was pressed (no pun intended) for time leaving the hotel, however this was really was more a minor inconvenience rather than anything significant. 
What disappointed me about The St Regis was that it smelled! My room had a very strong smell of mildew. It also needs a make-over. The decor is dingy and drab, which combined with the smell left me feeling disappointed - and frankly a little itchy! It's a shame really because the only other St Regis I've stayed in was in Singapore and it was great, which is was why I selected this hotel in the first place.