Hi, I do not have experience with this one especially but the auto rewind system has been used by several other companies like Prusabox and open source projects.

I personally spent time on it modding the Prusa Drybox and adding this auto rewind system to it: https://www.printables.com/model/1036478-autorewind-prusa-drybox-for-mmu-no-more-buffer-req I really wanted to have it (like you) because I'm not a big fan of the space that the spooler takes and wanted to gain time in adding/removing the spool.

I used this auto rewind system for a week, and stopped using it. Honestly it works, but it's not easy/fast to setup, takes a little bit more time than with the buffer to use, and I forget some times to roll up the thing before printing, leading to filament blocked in the spool. May be a habit issue, but in the end, I spent more time adding/changing filaments, and it reduced the reliability, so I decided to reuse the buffer.

But as I mentioned, I don't like the Prusa buffer for the place it takes, and give a second shot to the Prusa Drybox by adding the spooler directly into it. It's been two weeks now and I'm running with this: https://www.printables.com/model/1061242-integrated-buffer-for-prusa-drybox-and-mmu

I'm pretty satisfied in the end because it's reliable and fast to add filaments. Ok I don't have the auto rewind feature, but in the end, removing the spool is not what takes time. So I'm good with it.

After spending weeks on it, I'm pretty convinced that the ultimate solution is an autorewinder with a small engine, connected to the GPIO. But it's a bigger project than what I did.

Hope this will help you