As an owner of an AP1 and an AP2 at the same time, I can confirm that AP2 is nowhere near AP1 in terms of product maturity. AP1 still performs better, smoother. It also detects more accurately while AP2 sort of hunts for the nearest vehicles. Functions are available on AP1 that are not available on AP2 as cited in this post. AP2 owners have some, but not all of the functions as of right now and I wouldn't consider the two to have achieved parity.
With that said, AP2 is starting to exceed AP1 in terms of capability. It did play a part of why I sold my AP1 recently to get another AP2. Over the past month, we have noticed our AP2 does a better job on any non-freeway road. It is able to detect a "lane" even without markings where an AP1 would not even attempt to.
While I'm excited about the additional capabilities of EAP/AP2/FSD, I have to wonder if additional capability being released without the required maturity is a safety concern. Especially with FSD. I know what Elon is saying, but I just don't see FSD being available by year end. I do think they will meet the December date for EAP...just December 2017 instead of 2016.
**As of today, in terms of day to day living, the only major thing I miss on a regular basis is rain sensing wipers. If I think hard, I notice little things (I think I disengage AP2 more frequently, seems to "bounce" more in an AP2, lack of lane markings, etc.) but none of it really annoys me. I don't really think about being in an AP1 vs an AP2; except when it starts raining, I always get annoyed at my AP2. #firstworldproblems