this is good to see, its very very useful.
I introduced this to the guys on my team at work, even my 3d supervisor, as they had never heard of it. I was concerned that because our work is quite heavily detailed there would be problems as we are not using renderman. this is a cool little nugget to know.
The thing for me is that despite having some seriously powerful gear to work on, the cards can only take so much when heavy scenes are complete, so by not using keyboard 3, and doing a render with a node attached to the model instead is a bloody god send, just like the renderman sd node!!
nice one Dave