Have had our SFS 2.0t fwd for almost 2 1/2 years now. Quiet hwy cruiser and great fit and finish. We previously owned VW's and Hyundai is on par with anyone in similar price point in terms of interiors now. Absolutely no jiggles, rattles, or squeaks after over 20k miles. Have had a couple minor issues with fog light and rubber bumper for rear hatch door that were both quickly resolved by dealer. 2.0t is a great little motor with minimal turbo lag! Hyundai is making a believer out of me.
You shouldn’t lock the center differential when doing that test, what that does is it attempts to make all the wheels spin at the same time and would have most likely pulled out of that if 4wd lock wasn’t on.