Built with special additives to enhance comfort, power and feel, Head Sonic Pro Edge fits perfectly inside the new generation of softer, more playable co-polys. As with the original Sonic Pro, we discovered above average comfort and playability. This doesn't mean it's going to be soft enough for multifilament or natural gut fans, but it does suggest that Head has created a very accessible control string. For our team the most impressive feature was the bite. With its five sharp edges, this string grips the ball very effectively and provides easy access to spin. As for power, we found this string to be quite lively for a firm monofilament. Ultimately, for the player in search of a user-friendly control string with exceptional spin and decent pop, Sonic Pro Edge 16 looks very promising.