You know, I know that they made this as a novelty product, but honestly, the crease in the gel pad is just incredibly comfortable. It simply provides better support than a standard mousepad with a single-bar gel pad - it's spread out over your wrist rather than contacting at only a single point. Really helps with wrist posture.
Another benefit is that most pads with this structure are supposed to look like anime girls or are similarly sexual. Making it look like Deadpool is both funny and helps the user appear less like a creep.