We were passing through Nashville last night on a cross-country trip and, after much research, decided to stay at the Omni. It was a great choice. Every single member of the hotel staff we encountered was genuine and helpful - going above and beyond to make sure our stay was perfect.
I have an allergy to down and they put us on an entirely 'feather-free' floor. We ordered room service and weren't thrilled with one of the items, and it was immediately removed from the bill - no questions asked. Our toddler was sleeping when the room service arrived and the server went out of his way to be quiet and not wake her. The room was very clean, the pool area is gorgeous and the pool wasn't over chlorinated (there's also a bar up there with great not-too-sweet margaritas!). We didn't use it, but the gym looked huge and very well equipped.
We're crossing the country because we're moving and have the car packed with some of our favorite things, as such, secure parking is really important. If you self-park, the garage is a block away, but if you valet, your car is parked in the building's lot which only the hotel staff have access to. It was great to be able to leave our valuables in the car and not worry for a moment about them.
Also, I found the lowest rate I could online (expedia, priceline, etc.) and then called the hotel directly to book it and the rate they quoted was actually lower than what I found online.
Overall, fantastic stay!