I have played the ProV1 for several years and today decided to try the ProV1x. I constantly read the 1x is designed for higher swing speeds. I played my home course today and even with a slower swing speed (85-90) I believe the proV1x was a better ball for me!Less spin, equalled longer drives, more GIRs and even intot a stiff wind the ball responded well! Not sure on one outing ready to change, but today I am sold on the ProV1x. Slow swing and all!