Yes, I have been to the Falkirk Wheel. It is a rather amazing piece of engineering if you enjoy such things, which I do. You just show up and buy your ticket to ride the boat up and back down. The boat goes up the waterway a half mile or so, then turns around and comes back. It is also quite interesting to stand and watch it work. You can also hike around and watch from different vantage points. It was pouring rain the day we were there, so we didn't do much walking, but it was very enjoyable nevertheless. We spent about 3 hours there in all. There is also a self-serve style restaurant with a good view of the wheel.
It is a bit tricky to find by car, but Falkirk Wheel was a point of interest on our Garmin. It led us right to it. I think I would have had a bit of trouble finding it without the GPS.