Overall, the Box is very durable (can be dropped without harm, etc). Occasionally people break the lid off when the Box is open (don't hold the box by the lid), or by dropping it on an especially hard surface. The Box is designed to withstand side to side shaking as part of the normal technique of usage.
The only part which is delicate is the internal screen which is very thin -- use only the provided brush as a tool in direct contact with the screen. The screen itself is not replaceable. If the screen becomes damaged (whatever the reason) we send a replacement Box unit for free (it's part of the warranty).