I think its OK to start with DSC on and then work your car control skills until you're confident in turning it off.
BUT...once you get used to it being off don't start going back to turning it on unless you can just go back to letting the computer do its thing. Because when the the DSC starts to kick in...think of it as a boxing match of you vs the computer. While this battle of you correcting, the car correction, you correct the car, the car corrects you...your car is going god knows where.
I just picked up a 328i for my wife from the PDC. I was doing the skid pad and the car almost went off into the dirt on the inside. I was instictively correcting the car but so was the computer.
Bottom line is you and car or the car and the computer might make a good dance partner. The car, computer and you? Doesn't work.
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