I have used APEX about 15 times in the last year and have to say:
1) their prices are the best!!
2) i have had a few instances when the cards i received had no value on them when i checked the balances but each time one email was all i had to send and a new one was issued very fast with a very courteous response (unlike some other sites i have used when the info had to be forwarded to another department and would take a week to get resolved).
3) i didn't see a final response from the person who said they weren't responding to his emails but there has to be a logical reason (like in the spam folder) because these people have done exactly as they say and respond to my emails FAST and replaced the bad ones with new giftcards immediately. I couldn't ask better service than they have provided me each time!!