I've always stayed away because of horror stories of trimmed cards, but I just went to their site and was impressed/surprised by these two points:
Quote:
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Originally Posted by PRO Grading Site
1. Our holders filter out 98% of the UV-A radiation that damages sports cards by causing photochemical changes, brittle cardboard, fading, and color shifts. This is accomplished with a very expensive additive which we have in our plastic. You can't see the filter, but 10 years from now a collector will know the difference by the appearance of his cards. The ones in cheap holders will have faded, while the cards in PRO holders will still look as good as they do today.
2. PRO holders are all made of optical or medical grade plastics, which are guaranteed to be free of impurities, which are permitted in all commercial plastic. We do this because we recognize that many impurities can cause spotting and color changes simply due to the chemical composition of the impurity. At PRO we don't want to be the cause of a yellow spot forming on Michael Jordan's head five years down the line.
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Certainly amazed to read they use UV filtering holders.