I worked for a client in SLC for over a year and a half. Stayed at most of the major chain hotels in SLC and I have to say, nothing beat the convenience and location of the Springhill Suites by the airport. The management was very friendly and never let me down when I had to make last minute requests - I suspect being a Platinum Premier Marriott member and a long time guest at the hotel helped, but even so they were incredibly accommodating on room availability during busy seasons. The guests here are mostly business travelers and tourists, foreign and domestic. I tend to keep to myself at the hotel and if the walls were just a little better insulated I would not have known that anyone else lived at the hotel for the majority of my stays - which is kind of the way I prefer things.
So anyways, this was and is a great place to stay. I think you will find that the rooms are bright, clean, and spacious for a Marriott of this tier and location. I wholeheartedly recommend this to business travelers and tourists alike.