I did the dream car drive (like Pint bought for her husband)... same car too (F430). They let us take it to redline (would autoshift anyways), but the straight was so short that you would get to 3rd then have to brake and downshift (I opted for the paddles vs auto, yet it still auto shifts at redline). Even stepped the back-end out a bit and the guy said it was all good.
For $100, it was worth it. Any more than that and I'd have to pass, unless they were going to allow us to go a few more laps.