I have been running forced and non forced on and off and I do notice a difference, although slight, its still a difference . What i have noticed is a difference in lag during heavy applications. For example, with forced off, i run a linux emulator and it has to turn on the second core, or gaming or loading a program. However with forced turned on I notice the slight lag goes away because it does not have to send the instruction to turn thr second core on.
This is what I have seen, i continue to run forced only because I see no difference in battery consumption and I seem to have 0 lag. Only an observation, please tell me if u experience different, I am curious about your own experience with it.
P. S I will say that I have seen that while in forced mode it still only uses second core rarely. If u also have cpu tuner that there is a area "times" that u can see detailed usage of your cpu. It seems that the second core is radelyrarely used, but I still base my usage on the fact the I rather have it forcdd on so thrre is no pause or slight lag at all. I likr it more like a computer.