Mr. Mize,
For all I know, ISA could be a great company.
The thing is, it may impact the value of your card if it is in an ISA holder as oppose to PSA or SGC. For example, I have bought a few cards over the years by grading companies other than PSA and SGC, and on more than one occasion, they turned out to be altered.
In other words, I personally will always be a bit skeptical now due to my personal experience, and therefore would almost automatically pay less for a card graded by a company that is not PSA or SGC.
Still, I suppose we now know that no company is 100% perfect.
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