Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Biggest mistake I ever made

This is the worst memory card I've ever had the displeasure of using. It wiped out 3 of my video games so now I can't even play them, when you contact their customer service they will not respond to your letters or calls. I can't believe they are allowed to sell such junk. DO NOT BUY, instead spend the extra 5 bucks and get the real one, believe me it will be well worth it.