Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Doesn't Hold S blades well and opening mechanism problematic

I was so excited to get this holder because it held the S-blades. Sadly, they don't stay in place, falling out when one tries to open it. The opening mechanism is also problematic because half the time, it doesn't work. I've actually had to take it apart from the bottom to get to my blades.