Dyl
5
To be honest, I’ve only ever had two instances where I strongly disagreed with the grade that PSA provided.
- A PSA 9 Karen’s Umbreon that was later downgraded to a PSA 7. (read more below)
- The PSA 7 Vaporeon above.
That said, there have been many cards on eBay, PWCC, etc. that I chose not to buy because I thought that they were graded too leniently. 
So is it a gamble? Maybe. But I think PSA is more often on-target than off.
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