I have had my 1TB Space Black Air from the time I was able to pre-order this device and have been enjoying using it as my primary iPhone. I really love how thin and light this device is yet able to do anything I throw at it. Overall my experience is that the iPhone Air is an exceptional iPhone. Totally underrated in my opinion.
With that said . . . yesterday I pulled the trigger on a 1TB Dark Blue 17 Pro which arrives tomorrow. I have no intention to replace my Air with this 17 Pro for my main iPhone. I will still be using my Air as my primary iPhone. I got the 17 Pro mainly because of how much more you can do regarding photography using the new device. The Air did a fantastic job taking pictures but, coming from my 15 Pro Max, I have always taken for granted having the extra lenses for my camera and more options to take pictures or videos using the Pro series iPhone.
Ironically, I still use my 512GB 13 mini as my backup iPhone and that won't change with the introduction of my 17 Pro. Right now I'm at the point where it is nice to have all my devices paid off and able to have options with no sacrificing.