I like this sim very much.  It (surprinsingly) woks very well on my system.  It definitely has potential to be a great single player game.  The FM is great, one of the best, if not the best, single player one out right now (though I think the one in AH is a bit better).  The graphics are mouth watering.  It looks like a computerized, color version of gun camera footage that I have seen.  The damage model is better than AH (IMO).
I love the fact that when you flame a Zeke, it trails smoke and fire, with small explosions a few times on the way down.  Very immersive.  I was flying a Helcat against a Zeke, and when I hit it, I could see the strike of the bullets from one wing tip to the other.  As the bullets crossed the fuselage, there was a burst of smoke and flame.  Very cool!!
There are a few thing that I don't like about it (such as the view system and the small number of planes to fly), but these are probs that I can deal with.  
All in all, I recommend this sim to anyone hankering for some good ole PTO action in single player.  This is a sim that is gonna stay on my HD for awhile.  I ain't quittin AH though.  I got the game for single player stuff.  For my multi fix, I am stickin with AH.
Just my thoughts on a quality sim that complements AH, not competes with it.
-math
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"Any American fighter near Orote Penninsula.  I have forty Jap planes surrounded and need a little help."
-Ens. W.B. "Spider" Webb during the Marians Turkey Shoot