Yes I am a fan of PSTI and also ATHX.
Both are well financed, are into Phase 2 and 3 in proving there work in several areas and have the facts to show both.
I do believe stem cell therapies and cures will revolutionize medicine and so do many analysts and dozens of institutions.
I have reservations about CYDY. Not that their drug hasn't promise but where they are in relation to the goal line.
Mostly though, while I own a couple of hundred shares , I'm deeply concerned about their financials which are horrible. You should check them out. It will be a sobering experience.