From what I have seen, they are very good at what they do.
The structure of the group (not allowing other opinions) is to make sure that the masses who are clueless don't drown out the opinions of those who are experts. (Of course if there was way to allow outsiders who are actually experts to comment and prevent the clueless people from posting that would be great, but I don't see how that is possible.)
They offer the service for free, unless you are looking to resell the item. In that case it is $6.
In general, from the posts I've seen, they are quite patient and understanding with people not following the rules.
I don't think they get it right 100% of the time, but I think they are excellent on 99% of autographs. I think it is a pretty generous service.
I don't know whether they have an eventual goal to open their own authentication service or if there is a different end goal, but I think they are providing much more of a service than 99% of people posting on Facebook.
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