I haven't but I really wanna know what it's like.
And before anyone says anything, yes, it DOES make a difference. Just tested Rushing water + Fast Shot and Rushing Water + Trigger Discipline; the Fast shot character was noticeably faster. Can't imagine what the speed of all three would be like...
I know that if you get Fast Shot + Rushing water and use a fast gun like ALSID though, it'll literally divide by zero and make ALSID glitch up and fire slower.
I think I did this in one playthrough, although I'll have to check to make sure. Whatever I did, I had Lucky firing just about as fast as I could pull the trigger and ALSiD was was practically an SMG.
I rather use Rushing Water+Ain't Like that Now+Slayer. I kid you not, you become as fast as Bruce Lee.Take in Turbo and then your The One.
I did this in my most recent playthrough, and when you add the Katana+ with balanced grip to the equation, you become faster than Bruce Lee. I used this in conjunction with implant GRX, and I was literally running circles around my enemies, hacking them to pieces withing seconds. I specifically remember killing a super mutant, and having all of his limbs and his head sliced off before he even hit the ground.