Took this tour in 2016 and had a great time. Decided to go again in 2019 without the glacier landing, but got upgraded to fit into flight plans.
In 2016, it was absolutely clear throughout the flight. In 2019, there were numerous clouds, but they were broken enough so that we could spiral down to the glacier landing.
The two flights were quite different and, each in its own way, quite wonderful.
I highly recommend Talkeetna Air Taxi.