Depends upon how it's handled.
I've seen flux done by a method that uses no addition/subtraction:
Roll a "red" die and a "white" die. The lower die is read, and ties are read as 0; if the red die's read, the result is negative, if the white is read, it's positive.
So Red 6, white 4 is +4
r4 w6 = -4
r4 w4 = 0
It's pretty quick. (Chameleon Ecclectic used it in the Babylon Project.)
Players adapt to it really quickly.
There are real psychological differences between the CE version of flux and the 2d6-7 and the 2d6 vs TN+7... but the are primarily psychlogy and math capabilities.
(People add faster than subtract, as a general rule, BTW, but compare faster than add...)
I've seen flux done by a method that uses no addition/subtraction:
Roll a "red" die and a "white" die. The lower die is read, and ties are read as 0; if the red die's read, the result is negative, if the white is read, it's positive.
So Red 6, white 4 is +4
r4 w6 = -4
r4 w4 = 0
It's pretty quick. (Chameleon Ecclectic used it in the Babylon Project.)
Players adapt to it really quickly.
There are real psychological differences between the CE version of flux and the 2d6-7 and the 2d6 vs TN+7... but the are primarily psychlogy and math capabilities.
(People add faster than subtract, as a general rule, BTW, but compare faster than add...)