I have some indirect experience of adult adipose stem cell therapy: you'll like this.
My old gent Labrador, Ben, suffers terribly from arthritis and we were referred to one of only two vets in the UK who were providing the service (at the time of referral) - one is the Supervet himself (who was actually late to the party). Ben had several injections and although he didn't have the miraculous results seen in many dogs, he did get significant improvement and the treatment probably delayed the now-apparent serious decline by perhaps a year. He had a second treatment but we saw far less improvement, and as the insurance wasn't covering it and we had already spent £6,000 on it, we simply couldn't afford another round.
However, while researching the treatments I did quite a bit of reading and discovered that it is a common treatment for expensive race horses, and is routinely used on professional football players in Australia. If it's safe and effective enough to use on people and animals that are such expensive investments then it can't be a high risk treatment. We're just starting to see it rolled out a bit more in the UK, and it is even available on NHS at one or two hospitals who have pioneered the work.
I asked my GP and surgeon about the potential for my own knee but it was clear from their reaction that I was a long way past only having soft tissue/cartilage damage. The potential is there though and hopefully now that they have identified the many areas that can be treated with patient-sourced stem cells, thus avoiding any big ethical concerns, perhaps we'll see it embraced and further researched with real patients.