Today I rode the retracked Python in Efteling on opening day. I took the single rider queue and sat in the train with a group of three other guys who also knew it was just retracked and were there for their first ride in the new Python.
Just as we exited the station and took the first turn to the lift, the guy next to me said he could already feel it being much smoother...
For the guys who didn't follow the retracking process, the part from the end brakes to the first drop is still the old track. The other two members of the group also new that and corrected him.