When we did SWS (a few years after Sayhello) the guides were no longer allowed to book the helicopter tours for us, but they did recommend a company at the airport. We had a fine time, but it took up a whole afternoon (our main free time at the Grand Canyon), and one passenger threw up which almost triggered a domino effect in the whole helicopter. In hindsight, I would have rather stayed at the Grand Canyon itself instead of traveling out to the airport (by bus), walking to the company's location, waiting for our turn, taking the ride, waiting for the bus back, etc., and just enjoyed the sights close up and personal. You could easily hike a short distance down into the Canyon (say, take 1/2 hour to walk into it, and plan on a longer time coming up, with plenty of water and staying on the trails), and have a wonderful experience. Just my two cents.
The company itself was fine - they took a nice picture of us, which of course I bought. But unfortunately I can't remember the name of the company!