"Worth it" is a tough phrase to define, especially since much of this is subjective.
The answer depends on what you want for your kids. If you value a re-usable curriculum, the idea of a classical education, and the ability to school all your kids on the same history material at the same time, then yes, it is worth it because it lines up with your goals.
If these ideas hold no value to you, then it is not worth it.