PSA/DNA started out years ago authenticating vintage sports autographs and they did a great job.
However, I am not as optimistic now that they have branched out into all areas. They are not as solid in these other areas and I have seen signatures I am sure were fake with PSA/DNA holograms. It also bothers me that they claim to be able to authenticate people like GW Bush. Anyone that has seen his signature knows it is almost impossible to authenticate... and any company that claims they can is not being realistic.
I fear they have weakened the PSA/DNA Brand by branching into these other areas of expertise.