We are currently on our way home from our trip to Brazil and the falls. So sad to have left South America :(.
During our time to the falls, everything went very well and smoothly. Getting picked up from the airport was very smooth and our driver was incredibly nice. He took us to local banks to get cash, recommended a great dinner restaurant (la rueda, which was on your guys' recommendation list) and took us to our hotel.
Hotel St. George wasn't bad - I wasn't expecting a lot from hotels in Iguazu especially since we didn't book the premium hotels, and it was fine. It was nice that the front desk staff there spoke fluent English.
As for the tour itself, Francisco our tour guide was very nice and knowledgable. While I do think we could have done the falls on our own without a tour guide, it was a relief to not have to put in the effort to know where to go, what order to look at the various parts of the falls, or deal with crossing the border. We felt very taken care of and we didn't have to "think". Also, while it was a very busy day, we all thought doing both the argentinean and brazilian side of the falls in one day worked out perfectly. We saw everything and didn't feel the need to have spaced it out over two days. It was also nice that the park was not super crowded the day we went.
I would definitely recommend say hueque and hope we visit Argentina at a greater length soon in the future!