When I booked the DoubleTree rez I was staying at another hotel in SLC, and decided to leave after several days of no services to the room and less than friendly interaction by the staff at hotel 1.
We got to the Doubletree around an hour after booking. Ame was the front desk staffer that greeted us. Ame's greeting was a 180 from what we had experienced at hotel 1. She was friendly, happy and actually seemed like she genuinely cared that our stay was hassle free. We got checked in and had a room immediately. She offered us water and the Doubletree cookies. We requested service to the room on day 3 and it was an immaculate as when we checked in.
Additionally the fitness area, though it was a tight space, is probably one of the better ones I used in all of my hotel stays. They have 3 Peletons with to cages, 3 treadmills, dumbbells, kettle balls (not bells, medicine balls, & a multi-use station.
We never eat at the hotel restaurant so unfortunately I can't give an input on that.
In the end, if we were to go back to SLC, without a doubt, I would stay at the DT again.