This plane is insanely beautiful and packed with tons of animations and features - things like opening doors and windows in the cockpit - window polarizers and seat tables in the cabin - switch-click sounds in the cockpit - clean texturing, beautiful lighting.
If you thought the Carenado C-337 was beautiful, the Beech makes it look shabby!
I'm not a pilot IRL, but I have spent about an hour behind the stick of a real C-90. This rendition has the appropriate stick feel and the right sort of sounds to match.
Regarding FPS, the framerates are not as good as the C-337s - but not bad, either. They're more in line with what I got from their C-208 or from the Bull Stearman. That's understandable, given the detail, but I think the problem might be the switch-click gauge sound rather than the detail... I think that it might therefore be a drag unique to my system (I've had to delete sound systems from some of my other aircraft for FPS reasons, too - but again, I think that might just be me.)
If you want to see how this looks in FS2004, take a look at the screenshots Carenado has posted of it - both for FS9 and FSX - and that's what I'm getting on my system. If I'm feeling particularly motivated this afternoon, I'll post some screenshots - but I think I might be distracted flying it!