There is someone that we know here who has that same SC installed on his 986 and that since 2008 if my memory is good. He drives the car every single day and never complained having to change his engine once
It's all down to how you drive the car really and whether you had +100k before installing the kit.
In my case, I take the 986 out for a spin once or twice a month and I don't get used to using the gas pedal when I do - it's always floored. So in my case that would be a bit risky engine/pistons/lifters-wise. Unless of course I could find some +100 octane gas anywhere then it would be a different story
I'm guessing if you make normal use of the motor then you should be just fine!
+35rwhp? that is what my mate here claims he got out of his kit (dyno'ed). Sick eh