Instruct: Classify Amazon reviews into positive or negative sentiment
Query: A MUST have one if you have a PS2

If you plan on building your PS2 library, you MUST buy one of these to save games. These PS2 memory cards will only work with PS2 games, and you can't use the old memory cards to save PS2 games. In addition, it should be noted the premium price of this memory card (as opposed to other third party manufacturers or makers of PS2 memory cards) is well worth it. I found that I would run into problems (inconsistencies, lost files, etc.) when using memory cards made by others. Pay the extra and get the Sony.