I’ve had one for the last year. There are no membership fees, and no usage limits.
They do have a “design store” where one can specify how many of a thing the purchaser should be able to produce for a given price. I’ve never used that myself though, and outside of a little playing around with the sample material pack that came with it all my production work has been on materials of my own selection with great success.
It has its shortcomings and limitations, but overall the production quality of the machine itself as well as what it produces are top notch. I have no regrets about buying one.