When I went on my test drive about two weeks ago, AP was very jumpy and kept making small changes to keep the car in the center of the lane which caused very noticeable swerves back and forth. The salesman said that the car was too new and that it takes a while before AP learns to drive smoothly. I didn't see the number of miles on the car, but he said they only had it a few days. TACC was even worse. I tried it a few times, and each time as the car approached traffic it would start to slow down and then disengage TACC completely so that I had to take over and brake myself to avoid hitting the cars in front of me. Again the salesman said that TACC doesn't work very well on brand new cars. Those experiences would have driven me away from AP all together if I hadn't read so many forum posts and watched so many videos showing how well AP can work. I placed my order for a P100D last week, and the estimated delivery date isn't until December so I have a long time before I am going to be able to test it all out again for myself.