The casing feels light and a bit fragile but it is actually a tough durable product. The instructions to fit both the magnet and the pod to the bike are clear and easy to follow. Its also straightforward to pair the pod with your watch. I wasn't convinced the magnet would stay put on some of the rougher roads but it has, and both have survived a recent crash when cycling home from work! This is an accurate and helpful tool for any type of cycling participant. I took a while to choose this product and spent time comparing all the different products - I found this to be the best all rounder. Definately made the right decision.