This is a review by someone that has had it 24 hours so far:
Wow....this is an incredible sim...even in beta!
Just purchased this sim yesterday....I have been an avid simmer since MS flight sim was little more than wire-frame graphics, and having a heavily modded Steam-FSX, I gotta say Aerofly FS2, when it's out of beta, and has the upcoming fixes/add-ons, may well be the most incredible sim on the market.
For example, the photo-real scenery in and around Las Vegas, is astonishing for the sheer amount and quality. I have virtually every KLAS scenery add-on, and for as good as they are, they don't equal what Aerofly has done...and the speed with which it loads scenery is incredible...around 8 seconds to load any major city; LA, Vegas, San Diego, Frisco, Phoenix, or the Grand Canyon, etc.
One feature I really like is the ability to change the time of day instantly just tapping "T." No more having to pause to reload textures. The clouds are quite nice but for now are limited to height, density, etc. No weather effects are working just yet.
The 180 airports are highly detailed, buildings have individual lights, gates, and aircraft, but scenery outside the airports is low detail for now but the devs will be adding 30 gigs of scenery - which will be free. And being an early release beta, many functions and feature are not yet implemented. Still, it's amazing!
As for the aircraft....all are simply jaw-dropping. Even the Cessna is as detailed as any of the most expensive payware aircraft...right down to photo-real screws, leather textures, etc. that don't blur when magnified, better plexiglass reflections, sharper instruments, near-perfect interior moving shadows etc. And the panel/cockpit lighting is much nicer and more realistic than anything I've seen, especially on the big jets...and changing views is literally instantaneous.
What amazes me is how incredibly fast the sim is overall. Load times take only seconds. You have a detailed map (right down to roads) and can just move the cursor to any airport or other locations, even set the altitude, if you want, quickly by dragging the aircraft icon up, choose which runway, etc. and bam...you are there.
It really looks like this is the sim that will move people away from the patch-work add-ons for FSX and probably X-plane....and I'm not dissing either of those. The modding community has done incredible things new aircraft, textures, flight dynamics, etc....but aerofly, even in beta with many features not yet enabled, is a knockout.