I'd never heard of this game, but spotted a used copy in my local "Cashies" Not knowing anything about it I picket it up for AU$15. I've played for a couple of hours, cracked the civilian tutorials and a couple of the civilian missions. It's a great little time waster - As close to a flight sim as you would expect to get from the PSP. The graphics and sound are really qquite good. The load times though are attrocious. Not game breaking though. Flying with the Analogue NUB is VERY twitchy but after a while you get used to it. If you're expecting an action game, then stay well clear and go for Ace Combat X. This is more in the same vein as Pilot wings for the N64 or Sky Odessy for the PS2 - Both games which I played to death during their day.
I'll let you know how I get on with this game as I waste more time flying from A-B