I havent had any problem yet from gamestop. Though when I was buying my PS2, they were checking the 50 I paid it with (it was dated 1988) they accepted it without hesitation I bought there because the jackasses at best buy didnt accept the bill (it didnt have the security line in it).
Though irrelevant to this thread, I had a really bad inccident at game crazy once. After coming home from, I opened up my WiiSports resort, and saw it had no wii motion+.Took it back but they didint believe; im no thief!. So they gave me a new one. After that I swore never to shop there.