We finally made our way across town to Organ Stop and the drive was totally worth it! The organist is amazing! He does the music all by memory, even the requests. The room alone is pretty cool with all the different instruments to compliment the organ. From Disney to Star Wars to Classical Pieces, my entire family (ages 1-65 years old) enjoyed the experience. They released bubbles during the Little Mermaid's "Under the Sea" which, of course, the kids loved! I'm not sure why people are griping about the pizza though. We thought that the pizza was exceptional and we're pretty picky about our pizzas! We ordered a couple regulars as well as a gluten free pizza for my mom and it was easily the best GF pizza we've had anywhere in the valley (go figure!!) 3 large pizzas plus a small order of fries that was actually quite large, ran about $50, fed 6 adults, 2 kids and provided ample leftovers. It would definitely be cheaper if you're not needing gluten free.
Sure, it's slightly annoying that they only take cash but they do have an ATM in the lobby if you don't plan ahead. The water tasted terrible. (Maybe that's just a City of Mesa thing?) so bring your own or just buy a pitcher of soda for $5.
Aside from those 2 negs., I would definitely recommend Organ Stop and I will most definitely return!