I've had pretty good luck going from Revit -> SU actually using this method http://forums.sketchucation.com/viewtopic.php?f=18&t=3271&p=15926&hilit=revit+layers#p15926
I used it recently on a 3 story hospital rendering and animation. I brought in the building, site, mechanical, and structural elements. I can't imagine anything much more complex unless you had 3d furniture and such coming in from revit as well, which I didn't.
The plugins mentioned in the above tutorial made it very easy to apply the appropriate materials. I only skimmed TIG's responses but as I recall the components worked decently - that is to say, it did actually create components rather than just having everything in groups which could be a nightmare. So changing one window element might not change every window element but it will probably change a fair number of them.
Most of the hassle comes in cleaning up the model which will likely be far more complex than you need - but that's neither Revit, nor SU's fault.
-Brodie