The entire tour was a great experience, from Maid of the Mist all the way to the cave where you actually stand under the falls.
Over the Falls Tours is absolutely worth the price. We had a private tour and our tour guide picked us up at our motor coach and was very knowledgeable about the entire area.
I highly recommend Party Marty, he was born and raised in the area and has tons of local knowledge. Extremely personable, funny and professional.
I would give Marty 6 stars but trip advisor will only go to 5