I can add my experience here and hopefully some people find it useful. I did many, many hours of research before buying the Mavic Air as my first drone. I also watched every YouTube review out there, but I realize many of them are paid by DJI so I mostly just used them for information purposes. Part of my decision was influenced by the fact that the Mavic Pro was at the end of it's product life cycle (Pro II was rumored for April, and now it looks like June or later), and the Mavic Air improved upon the aging Pro in some important areas (gimbal protection, design, video quality/bitrate, quick shots, panoramas, and obstacle avoidance) all while being considerably smaller. It can't fly as long but I find I have yet to be in a situation where I need more than 20 minutes of flight time (that may change, and more is always better). Range is 4km instead of 7km, but I have also yet to be in a situation where I needed/wanted to fly more than 1-1.5km away and to be honest I would probably be too nervous to max out the range on any drone anyway in case it got caught in some wind or something. I have never seen anything other than max signal bars while flying, and I have never seen choppy or noticeably laggy video transmission - rock solid so far, even when testing in urban areas. I recently also watched a video where someone was chasing oil tankers with their Mavic Air, and the signal had no problem around those giant metal ships which seemed impressive to me.
I have flown right next to people with the Mavic Pro, and the Pro is definitely quieter but it's not night & day. The pitch is lower which also helps with perception. Once I am out 50 feet or so, if there is any ambient noise at all (traffic, water, etc.) you can't even hear the Air. People who came up to me had no clue where my drone was until I pointed it out. I was all nervous about attracting attention when launching next to people (I brought it to Hawaii with me and launched it at lots of viewpoint areas, occasionally with people around), but in practice it has been a complete non issue. Both the Air and the Pro make enough noise such that they are very obvious when taking off/landing near people that they both get the same attention as far as I have seen so far. Fly them away a bit, and you can't hear either of them, so it quickly becomes a non-issue. This has been my experience around crowds at viewpoints, but YMMV. If you're shooting weddings or something, hovering above people for extended periods, I can totally see how you might want a Pro Platinum for the absolute minimum noise.
I can carry my drone (in it's protective hard case), controller, filters, and 3 batteries in a Peak Design Every Day Sling 5L which is a very compact bag. It's so easy to take with you, and you can be in the
air 2 minutes after you arrive anywhere. It's just as easy to put away and carry on with your day - this goes such a long way to me actually using and enjoying the drone when the hassle factor is so low. I'm sure it isn't much different with the Pro, but the Air is lighter and unquestionably more portable, and I love that the Air controller has removable sticks so you can tuck it in a much smaller compartment. It's size is also such that I think it is less threatening to people, and anyone not familiar with drones would be more likely to think it's just a toy and dismiss it's presence.
My first impressions were basically that I was stunned by how good the Air was. It has tons of range (for me anyway), in general I had zero issues with anything, and the 4K 100Mbps video quality is very good (as good or better than the best smartphones like a Google Pixel 2 or Samsung S9 who use the same sensor size but probably a lower bitrate). Sometimes I had to wait 2 minutes to get a GPS lock before taking off but I don't think that is specific to the Air. The lens has some distortion if you look close (slightly wavy horizons) but it isn't a big deal - I've had $3,000 DSLR lenses with more distortion. The flying precision is incredible, build quality is very high, and it is very responsive. Hand launching and hand landings are incredibly easy, so you don't have to worry about the terrain - so easy that I returned my Polar Pro landing gear as there is no reason to use it. Nothing about the air is like a toy in my opinion. It handles wind pretty well but I was a little paranoid about wind and never sent it up in anything too crazy. I also bought a little wind gauge to double check things. I am a professional photographer so I would have liked a larger sensor, a variable aperture, and more manual controls, but you can't have it all in something this portable. It is such a good mix of size and "high end" features that it makes the perfect take-everywhere drone or travel companion. If the Mavic Pro II blows my mind, I might trade up to that, but size is a huge factor for me. When the 1" sensor rumors on the Pro II got quashed, I lost a lot of interest in it and bought the Air since the gap between what it is rumored to be and the Air got a lot smaller (for my purposes anyway). I really can't see anything that is going to hold me back with this drone, at least not for a very long time. Here in Canada, the Air Fly More combo is $1350 and the Pro Platinum Fly More combo is still around $1900 so there is quite a significant price difference despite the similarities between the two. For that money I would be tempted to just get a
Phantom 4 Pro for that 1" Sony sensor (huge upgrade), but obviously far less portable.
I made my first ever video after spending 2 weeks in Hawaii, and I think it came out pretty good. Shot in D-Cine 0,0,0 and did all my editing in LumaFusion on the iPad Pro which is fine until the export, which is painfully slow on weak iPad Pro hardware. I will have to decide on some desktop software later (PC) as I do not want to pay another $20 USD/mo for Adobe Premiere (already subscribe to Photoshop CC).
Anyways, I absolutely love this drone. If the Pro II was going to have a 1" sensor (I guess it still could, but the leaks seem pretty credible and the camera would have to be physically quite large for the lens to accommodate that image circle) I would have probably waited to see the size/price, but I have zero regrets about going with the Air and I feel like it has already paid for itself with how much enjoyment myself (and others) have got from it, which is really the point at the end of the day.