Spent a few nights at the Palazzo, then came down to the Cosmo with a group of friends.  Completely different vibe than most other Vegas places.  The Cosmo is definitely a higher class (read pricier) place, but has a more edgy and trendy side to it.  No cheesy statue of Caesar or reproductions of ancient Eurozone here. Rooms are fresh and inviting, and the casino area even has a better feel to it.  This place is in the CItycenter area, so be prepared for a hike if you are wanting to see TI, Wynn, or other casinos on the north end of the strip.