We have stayed many times at the Mirage, and have encountered their poor, non-supportive mattresses a few times now. After the 3rd night in one of their suites, I had a terrible neck and back ache! I hope they replace these saggy, far-too-soft mattresses in their suites!!!
Other than that, I love the hotel and everything it offers, but waking up with back and neck pain from a non-supportive mattress does put a bit of a damper on your morning.