First of all welcome to our board!
I hope you enjoy your stay and I am looking forward to learning from you as you will learn from others here.:thumbup
As for your post ( I hope you are not too disapointed in my positon/explanation and pelase understand that this is no flame):
I personally dont know of any successful complaints on a G35.
In 90-91 customers complained about too much dusting and short brake pad life as well.At the time the early Q45 was one of the very best stopping vehicles out there and even out-braked some sports cars despite its much greater heft.
Even by todays standrads pretty good.
The factory figured performance oriented drivers wouldn't mind replaceing pads every 12-18 months (I sure dont) in exchange for class leading brakes.
But due to complaints about short life + dusting, the factory changed the pad formulation and made it harder resulting in a new pad and stated installing those as standard and as a result owners enjoyed longer life+less dusting.
The old softer, better braking, pads can still be had under the old 1989 part# at Infiniti dealerships and those are the ones I always insist on.
Fast forward to 2003, the G35 has brakes that outbreak nearly everytihng else on the road even the base brakes out perform nearly all otehr cars.
Outbrake all or nearly all competitors from Lexus, BMW, AMG even Porsche.
But they dust and wear just as much as those in an AMG C32 BMW M3 etc etc..
An alternative ,would be aftermarket pads which might give you a bit longer life, but would reduce your braking performance to that of a lesser vehicle (and may warp your rotors early, which BTW also wont be as long lasting, as those on less performance oriented cars).
Sorry, I dont have any better news, but I hope you can relate to my explanation.