Our beautifully furnished spacious suite included a nice kitchen area and a very well fitted huge bathroom, with two basins, a separate shower as well as a jacuzzi tub. The whole hotel is smoke-free; a big plus in Vegas. Unlike the big hotels, in Signature the distance from the suite to the elevator and from the elevator to the entrance is short. Staff were friendly and helpful and we never had to wait in a long line, as we have had to do in other hotels.
We stayed in Tower 1 with Starbucks (which closes at 5pm) and a lounge on the ground floor. A link corridor gave easy access to the deli in Tower 2, so eating in was convenient. The deli is supposed to be open till 9pm but, when we were there, it closed at 5pm on two evenings (no explanation was given).
There is a link corridor with three travelators to MGM Grand; as others have noted, it’s a fair distance.
In short, this really is a very nice place to stay close to The Strip.