2 SP sooner obviously means a lot. You reach your options / goals a lot faster and with the mediator SS that drains 1 SP you basically do also what shade does.
Sounds like a very great and good opening, but i haven't seen it in action to say exactly if it's really overpowered.
Again: the opening itself is simply amazing!
and it's funny that people complain about shade when this one takes the cake and eats it too