What do experienced swimmers think about the Speedo Fastskin LZR Racer X in terms of its performance and comfort during long swims, and are there any specific features that set it apart from other high-end racing suits? How do the compression and flexibility of the suit impact a swimmers technique and efficiency in the water, and are there any notable differences in how the suit performs in different strokes or distances? Additionally, what are some common issues or drawbacks that swimmers have experienced with the Speedo Fastskin LZR Racer X, and how do they compare to other high-end suits on the market?