Oh you mean their Visual model

Yes, couldn't agree more there. Very pretty. They even do some nice lighting tricks in the cockpit that emulate x-planes default lighting (shame it's a hack though because discrete levels != smooth changes).
The systems detail on the NGX looks to be the best I've seen, although tbh, a lot probably won't be appreciated. I'm still going to wait for the IXEG 737 classic. It will probably be closer to the ifly level of systems depth, but it's all about how she flies

I also want x-plane turbulance and weather to be 'tweaked' as well as sorting out waves on water (Tsunami!).
There's still a way to go forward still on x-planes flight model, but I think it's among the best around at the moment. An 'engine maker' app like the airfoil and planemakers would be good for devs too I hear.
I think they key to x-plane 10's success (on top of the default sim improvements) will be the number of addon makers putting products out and both the visual, weather and ATC improvements to the sim.