I purchased 4 sets of Tonic ball feel in December to get them strung to a couple of racquets. Most of them I sold them before I string them with the Tonic. Not long ago I got a Wilson Rok 93 unstrung. I got it strung with Tonic at 24kgs a few days ago, around 53 lbs. It was the first time I experienced natural gut. All my previous experiences were with the strings that my racquets came with (Prince syngut, Wilson sensation, Mfil, Yonex Pro Tour). The initial feeling was that the gut string was thinner than 16 gauge. Suddenly I felt like I was the king of slice. Although you can say that 53 lbs with natural gut is loose the Rok felt not more powerful than the K Six One 95 18x20 that had Wilson sensation sting at the same tension or more and of course was used for more than 2 months. I had not played before with the Rok, so my first taste was with the Tonic. Now I will get the K 95 18x20 strung with Tonic ball feel as well and get rid of the Wilson Sensation. I have to admit that I got so used to the feeling of the K 95 that I have not even overgripped it, I keep playing with the initial True grip. It was white and now is almost black. But soon the K 95 will have a set of Tonic ball feel at 53 or 54 lbs, maybe 55.