CraigNZ
Modern D might be slightly more resource intensive than Modern U, but not hugely I don't think.
I caved and bought Modern D tonight, and it is magnificent (I feel pretentious using that word, but it's really a fantastic achievement). By a wide, wide, wide margin I think it's the nicest sounding Steinway D library out there.
The hammer mics alone are incredible. It's great to have the flexibility of all the other options, but having just the lone set of mics turned on makes a beautifully balanced sound with huge dynamic range. I love the percussiveness.
If I won't straight up say it's the best grand piano VI I own, it's only because of stubbornness (and continued loyalty to the Kawai legend and VSL CFX…and recent fondness for the Vienna Imperial!).