I'll echo all the praise from other posters, and offer one tiny bit of criticism: I don't like the motion damping (or whatever it's called) when panning/zooming around. It feels like wading through mud. I'd prefer it much reduced, or removed entirely.
EDIT: From 12/1989: "Will Clock Speeds Top Out at 50 MHz? An issue that computer designers can't seem to agree on is the ultimate potential speed limit of microprocessor clock rates. The more conservative argument, put forth at the Microprocessor Forum by Microprocessor Report editor Michael Slater and several other conference speakers, maintained that clock speeds will top out at about 50 MHz[...]"