All that you get with this tour you can get with the state park Discovery Pass which is about $45 in 2019... except the "history tour" and front of the line privileges at the Cave of the Winds.
The history tour was about an hour long that consisted of the guide telling a few stories as we walked from the American side of the falls to the Canadian side of the falls. Out of that hour, about 20ish minutes was provided to allow time to admire the falls.
So the money spent on this tour beyond the $45 was for the front of the line at Cave of the Winds and about 30 minutes of a guide telling you a few anecdotes.
My opinion, unless you're going during peak season and want to skip the Cave of the Wind line... just buy the pass from the state park system.
On that note - the falls were awesome. The Maid of the Mist ride was great! And the Cave of the Winds was the best! Well worth the $45 Discovery Pass.