Not to be a kill joy, but um, no, not worth it in my opinion. Montessori toys are...ok, I'm feeling kinda mean now (I was going to type some not very nice adjectives). Put it this way: I think Montessori toys are not worth the money. And I REALLY think a subscription system to Montessori toys is not worth it.
I see Montessori toys ALL THE TIME on facebook marketplace, and marvel at the outlandish prices even when people try to sell used. Do you know what my kids love to play with more than anything else in the world? Amazon boxes and sticks. Like, sticks from outside. You know those wooden kitchen helper stand things for $200 that Montessori people are all about? Just use a nice, sturdy step-stool from Home Depot. $20 max, takes up way less space, and can be used for a multitude of other tasks.
But if you really love those types of toys, you can get them so much cheaper on the used market. I kinda hate toys in general. I spend a not-insignificant amount of time getting rid of toys, honestly. Really basic toys (wooden blocks, legos, puzzles, matchbox cars), and the fewer the better, has been my philosophy. I spent the first seven years of my kids' life in an 850 sf apartment, so part of that has been due to necessity.