Took the midnight sun tour July 8.
I initially signed up primarily to cross the Arctic Circle, but that part of the tour was a little anticlimactic. You do the photo op at the sign, use the restroom, and that's it.
I did find the stops along the way to be very interesting. Particularly enjoyed stopping at the Yukon River to eat the lunch and dinner I brought along (the restaurant there is currently closed, and they do a good job advising you during booking).
Also good to learn about the pipeline, permafrost, and the different landscapes. There are also a couple of stops at scenic overlooks, and if when it's safe to do so, the driver will slow or stop for wildlife photography.
And fun to travel the Dalton Highway. After the novelty wears off, the scenery is still nice.
We lucked out, got a nice photo op of the (almost) midnight sun on the return.
Beware it is a long day, riding in a bus. And the return trip seems longer, because you saw most of the attractions on the way up. I think there's an added-cost option to continue north beyond the Arctic Circle sign and fly back.
You do need to plan your fluid intake, since the interval between some of the toilet stops is a couple of hours.
Start of tour is well-organized. You meet near the airport, and there were no check-in hassles. Because the Yukon River restaurant is closed (as of July 2021), the tour starts with a trip to a local supermarket to pick up food for lunch and dinner (unless you brought your own).
I would do this tour again. I think there's also a version that leaves earlier and returns earlier. Travelling in the midnight sun sounds really cool, but it's the last couple hours of the trip and I was saturated from the beautiful landscape I saw in the morning and after noon.