We went to the Spirit of Aloha last year. We didn't share a table as it was only the 4 of us. However, it did look like some tables were shared.
To me, it wasn't worth the price. I didn't care for the food, but my family did. I would rather have gone to the California Grill or Citricos. The show is okay, nothing great. If you have been to a luau in Hawaii, you can't compare the two. I was disappointed in the show. I was comparing the show to the one I saw in Hawaii.
However, my family enjoyed it. It is all you can eat and with a teenager, it was worth it for him.
Whatever you decide, enjoy!