So for you since you play this one and was on the confidential playtest, still S7T? You play them at the same tension?
Yes, I am still using S7T as my go-to string. And I did play them both at the same tension.
My impressions are that Confidential is a really good string. It kind of mixes and matches the attributes of the other Solinco strings I've used - Hyper-G, Revolution, and Tour Bite - and the unique combination in Confidential kind of fills out their lineup. There really is a string for just about every desire among those four.
Compared to S7T, Confidential has better control and linearity. How hard you swing almost perfectly determines how fast the ball goes, so length accuracy of all shots, from volleys to the hardest groundstrokes, is better and the control feels immediately accessible.
S7T has slightly better bite on the ball when new, and retains more spin capability as it ages. Confidential seems to lose the sharpness of its square edges in the same way that Tour Bite does for me, but Hyper-G does not.
I also had problems with Confidential notching heavily after only a few hours of play. I think I got to about seven hours and they were notched half way through. The stringbed locked up before this and at that time, the spin capability and launch angle both decreased. S7T also notches but retains its initial playing characteristics for longer - it's only in the last hour before S7T breaks that I notice a big change in the way the ball comes off the stringbed.
And S7T has more putaway power for me, and lets me hit a bigger flat first serve. And it's a bit more comfortable and forgiving overall, both on well centered shots and those that I mis-hit.
I might feel differently if I used the 1.20 gauge of Confidential. The 1.25 was pretty chunky in my dense 18X19 SW104 pattern, but then I'd be even more concerned about durability. I get probably about 12 hours on 17 gauge S7T before it's ready to break, and I only got about seven with 1.25 Confidential.
And for every reel of Confidential I could buy, I could buy a reel of S7T and a case of balls. S7T is tough to beat for my game and my lack of willingness to restring often - add in the value and I haven't found anything to make me consider changing.