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Most people agree, including clued up engineers suggest you should vary the rpm and load the engine to bed it in. Id say as long as your not bouncing off the limiter in every gear, a bit of hard driving wont do it any harm.
I seem to remember someone telling me that cars built 20 or 30 years ago needed to be driven careful for a set number of miles partly to run it in but also because the engineering tolerences and built quality wasnt so good, if something went wrong at least it would do it a lower speed and "hopefully" not cause such a mess.
I agree with previous comments , though that as long as you dont thrash the nadgers off of it and dont make it labour.... i.e. going up a hill in 4th at 20mph.....then it should be ok. Conversly if you have a diesel you are supposed to make it labour as soon as you get it..... interesting!!
Just be sensible with it, Id say. Let the oil warm up - dont bounce it off the rev limiter and just take it easy. I must admit though, a few days after I got it, I blatted it onto the motorway and grinned from ear to ear with the power from 4,500rpm+ - very intoxicating!