The Signature is a nice property, connected to MGM grand via corridors. The staff is polite and efficient. The breakfast place downstairs is slightly overpriced for what it is, but is not a bad option.
Keep in mind that it is not an actual suite, but adjoining rooms. Call the hotel to confirm that you’re together - we had a problem with that and were put on different floors. Donna did her best to contact the hotel and make sure we had an opportunity to move rooms and be together.