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I was hoping to get 17.17.4 sooner rather than later because my X has a mild case of wavy/dancing line syndrome. Happy to say, I received the update last night. I of course immediately went out on local roads (30-45 mph speed limits) to have a go at AP, and color me impressed. In my limited (20 minutes) of AP driving on 17.17.4, I would cautiously- and giddily- suggest AP2 has reached parity with AP1 on local roads during night-time driving, with clear weather conditions. Cautious because I've only had 20 minutes with 17.17.4. The AP was smooth, handled curving roads with ease, including 1-lane roads with markings only on the middle line. Curiously, I did notice the guidelines mildly wavering. Automatic high beams for some reason didn't kick in when I had expected them to on roads that were dark. All in all, based on my thus far limited test drive, 17.17.4 AP2 is looking to be a significant and encouraging improvement.
More to come. Cheers!