There was some discussion about it here a few months ago - maybe someone who tried it will chime in. In the meantime, here is the most recent article from Mayo Clinic:
https://regenerativemedicineblog.mayoclinic.org/2021/08/12/regenerating-the-rotator-cuff/
This 2021 article in Science Direct seems to me to conclude that it is promising but requires much more testing:
https://www.sciencedirect.com/science/article/pii/S266663912100047X
According to my (very trusted) ortho, it works in limited circumstances but can be worth a try for avoiding surgery.
Do you have a full or partial tear? What therapies have you tried so far?

Sue