My impressions from the store are largely the same as the OP's.
Pro - the orange in person seemed a bit too much as opposed to the photos. It looks nice, but I know the novelty would wear off for me and I'd be better served with a more neutral, more muted color. The silver doesn't look impressive at all, looks rather bland with the unibody design, but the blue one looks really good in person. It's a shame about paint issues, though. The Pros have never looked less premium and less enticing to me. I particularly dislike the back plate which shines under certain angles and stands out too much from the rest of the body. That plate doesn't sit flush on all corners, too. All in all, I wouldn't buy this phone.
Air - massively underwhelmed. I have my doubts about the performance of this phone, but I did expect to be impressed with the new design and the thinness. When I held it, different story. It looks nice but that's it, no wow factor for me. Given that this phone's main advantage is the design, I was surprised by how uninspiring it was for me when I saw it in person. If it didn't have the plateau bump, it would be a different story, but that bump is just too thick for me to appreciate the thinness of the rest of the phone. What surprised me the most is that I could see frame drops already, on day 1, on a brand new unit. This tells me the throttling will be real in this one. When it comes to smoothness of the user experience, the difference between the Pro and the Air is clear, which is surprising as I'd expect that to show when the phone runs hot. The phone was not even warm and I could see frame drops in the first few seconds of scrolling through Safari, and other apps had this behavior, too. I think the Air will either have average-at-best battery life or it will underperform considerably as opposed to the Pro, because of thermal throttling.
Base - not much to say, same phone as last year, now with ProMotion. It's clearly not as fast as the other two. Given that the A19 outperforms the A18Pro which outperforms the chip in my 15 Pro, I was surprised that the user experience isn't smoother on an A19 with ProMotion in comparison with my phone. Granted, different OS, but still, if the performance gains are so big and the phone now has 120Hz, why am I not seeing a clear difference. The specs tell me that this phone should be faster and smoother than it is, but for the price tag it's a great buy.