I just tried X-One Biphase (17) for the first time and it felt really weird for the first hour or so. The bedstring was making a very noticeable pinging sound and the frame was vibrating when just lightly bouncing the ball up and down. This was with a dampener too. I suspect this is because of the “break-in” period that I read is associated with this kind of string, but can anyone confirm it? Anyways, after some more ball bashing it started to sound better and the vibrations were mostly gone, but it is still doesn’t sound very crisp at impact. I played about 2hrs with it so far. This is on a Microgel Prestige mid+, strung at 55lbs and using a dampener. Other than that I liked this string quite a lot; it has very good ball pocketing and plenty of controllable power. Next time I’d go tighter though because it feels kind of elastic now at 55.