Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Poor Design

First problem. Getting the front and back pieces of the case apart without damage was somewhat difficult.Second problem. Putting the two halves of the case back together so that they snap together without damage is also more difficult than it seems it should be.Third (and most serious) problem. Although it's possible to operate the Zen without removing it from the protective case, the design of the case interferes with the proper operation of the unit. Pressing the Back button on the Zen activated the Play/Pause button instead. This happens because the plastic tab on the case that should depress the Back button on the Zen is offset from where it should be; so the wrong button gets pushed. You can fiddle with the case and the Zen to get things lined up, but they won't stay aligned.Because of these problems, I would not recommend this product.