Review for MGM National Harbor Review For MGM National Harbor Google User Dec 10 '16 at 21:49 Reason for one star rating. Was the membership $10 free play wasnt working. I witnessed not only myself but 15 other with the same problem. An the membership desk pretty much told everyone that was having the issue, that we just couldn't understand how it worked an that we had used it up. I myself was betting $0.50 so at $10. Thats 20 spins not on me. Nope took my money an on second spin said the $10 free play was 0.00 balance. Many people had this problem. Also if your machine went down more an a few people had been sitting at the machine waiting for service at 30 or minutes. View full site to comment or like