Lyft credits for McCarran to-from any MGM property (MGM50) will knock 50% off of two rides. I like this. I also like that you can request a review of your trip, in particular because my husband and I were longhauled 22 mins. 4 secs. (!!!) through the tunnel and down the freeway on our way to the Luxor a few days ago, and Lyft quickly reviewed the trip and refunded our money. We usually give the "no tunnel, no freeway" speech to cabbies, and didn't think we needed to break it down to the rideshares. Lyft holds their drivers accountable.
What I don't like is the location of the Rideshare Area at the airport. It's tucked into the dropoff area with hardly any signage. It's easier to just hop into a cab and go to the hotel. Plus, without the credits, you're basically paying the same as you would for a cab, or not much less. We enjoyed our Lyft back to the airport very much, so we'll cab to the hotel, and Lyft back from now on. Four stars.