I've done a bit of reading on this. I think Class Pass is a good deal for only a very small sliver of people.
And by this, I mean people who go to a lot of exercise classes, and like variety, and live somewhere expensive.
I used to go to a lot of workout classes. Of course, they were almost always classes WITHIN my gym. And only ones that were included. Step classes, aerobics classes, etc. When spin was "new", the gym charged extra. I didn't go. When it was old hat, it was included, and I went.
I see the same at the YMCA. Most classes are included, but each year there are one or two new classes that cost money. Awhile later, they are included.
For a brief period of time, I did yoga at a studio on Sundays, and it worked out to $10 a class.
Most classes in expensive places can cost way more than that. If you are paying $25+ a class, and you go 5x a week, something like this is a no-brainer.
But that's a very small sliver.