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It isn't bad, but you should be varying the speeds on the freeway.
I changed between 65 ande 75 and 85 mph on the freeway every 5 minutes during the break-in period, with the exception of when a cop is on the road. And I never redlined it during the break in period.
P.S. For Everybody: Please, let's not make this into a "Break-In Debate" thread. Thanks.
The break in period is a bit overrated in my opinion. I've driven cars through a variety of situations during the break in period, and have always achieved good overall performance over time (gas mileage, etc.).
My IS has mostly highway miles on it, and I have 2300 miles so far. I did vary the driving conditions a bit by driving at different speeds on the highway, but that is it.