Total noob here... Just received my copy of RealFlight G2 today. Got it from
Heliproz for $188 (their site shows it as $199, but I was charged $188, and the sticker on the box showed that this was indeed their correct price).
Being a total newbie and intent upon learning to fly RC heli's, I soon discovered how difficult it is to control the little beasts. I've been rewarding myself by letting myself take programming breaks to play with RealFlight and I can now make some sense of what all the controls are doing. Keeping them coordinated is another matter. I still can't hover motionless yet.
I am impressed with the level of detail. I have a pretty decent system (P4 2.4Ghz, 512MB RDRAM, GeForce4 TI4400, Creative Labs Audigy 2) and there is no lag whatsoever. When I give an input, I feel it immediately. It is very nice. The copter's motions are fluid and smooth (referring to the graphics here, not my flying skills).
I am already impressed by the fact that this software can save yo a lot of money. I have crashed numerous times today, and if I were doing that to my real copter, I'd be spending hours and lots of money fixing things.
As for comparing this product to aerofly, I can't... I haven't used the other one. But I figure for $188 for a popular and seemingly well-supported product, it is well worth the cost as I attempt to overcome a steep learning curve to where I feel I will have some idea what I am doing come time to try it on the real thing. At least I will have experienced learning to coordinate the controls, and what it's like when the copter is flying towards me and everything seems backwards.
From my brief experience, I do recommend it highly.