It works okay. The mains on my racquet are narrower than the width of each of the two "stars" that run up and down the string. While I straighten one string, the one next to the other star is pushed over alignment. As far as it straightening the crosses, it does very little to those as well. Would like to see thinner stars and more accurate advertising. Works better right after stringing vs. after a set or two of playing. If you have wider mains, it may work better for you. Used on Head Graphene Speed Pro.