For my style, S7T allows me to play a much more effective game. It has equal or higher putaway power when I flatten the ball out, and much greater spin capability so my serves move more and bounce higher, and my groundies have more spin with the same swing but much greater spin if I really try to loop a heavy topspin shot. It also has great tension maintenance so the response stays consistent for at least 90% of the life of the string before it breaks.
The downsides to S7T are that it is more sensitive to incoming spin, that it is a bit harsher than Lynx Tour, and that there is a bit of springiness to S7T on softer shots that makes the response a bit non-linear throughout my full range of swing speed capability. I've adjusted to that little bit of non-linearity and now don't notice it at all.
As far as strings with greater spin capability, the ones that come to mind are Hyper-G, V-Square, V-Torque/V-Torque Tour, Ultra Cable, and Cube. Of those, I would consider Hyper-G to be my favorite, over Ultra Cable only because Ultra Cable is too thick for my 18x19 pattern racquet. The others all have durability or playability-duration issues.
