I have used it and talked to/worked with other people that have used it. I read ALOT on other forums, mainly studying how people do with different supplements/therapies. I also devote alot of time and effort towards research on any particular supplement/therapy before I use or recommend it.
Of course everyone is different and is going to have different experiences with anything, but I have experienced/seen definite results in those with fairly obvious Th2 dominant conditions. Flipping that switch on can be a rough ride for some, so I recommend starting slowly. PCE isnt the worst for runaway inflammation from what ive read and experienced, but it can really kickstart inflammatory symptoms.