I haven't played or seen the Studio 90 but if it is up to Fatar's usual standard you'll be very happy with it as a controller. I have owned a Fatar SL-990 for four years and it has a fantastic weighted feel. I tried quite a few weighted keyboards when I got it and decided the Fatars had the most convincing piano action.

I think you'll be very satisfied when your controller arrives. Please post a followup to this when you finally get it to let us know how it is to use.