Well I just downloaded it, and it looks nice. However, I guess you can't use a keyboard to control it, you have to have a game controller. Playing with the F1 key, which is throttle hold for heli's (IIRC) produces some wild maneuvers. The flight model doesn't "feel" very realistic.

I have RealFlight G3, and it has an extremely realistic physics model (minus ground effect). I can vouch for it as being well worth the $210.00USD I payed for it.

Edit: Viewed the movie of the Raptor 90 from the website. It looks like a pretty neat package, however it's pretty aparent from watching that video that it is not quite as fluid as G3 is when performing 3d acrobatics. I'd say its a heck of alot better than FMS, so for 30 bucks I think you got your money's worth (and then some). The graphics aren't as good as G3, but I think that you'll learn what you need to from this sim.

I noticed it is java based, I wonder how much of a system resource hog it is.