I've actually done it, and it works fine.
Be aware though that if you use Corsair PWM fans, those needs a stronger PWM signal than most fan, and if you got 8 of them on the splitter, then they would run at full speed if PWM controlled.
Other than that, works like a charm. Seanimus actually linked two of those splitter and connected them to a single channel on the aquaero 6, and controll all the fans via PWM (see
this post).
Cheers