Never. This one's my racing cherry.
Got to say I was dead lucky to get the tickets. Submitted a random entry for a lucky draw and got a pair of tickets
You been to one before? What is it like? Does it just whizz past and the sound coming like a year later?
You might want to invest in a pair of earplugs or something if you're close up. Seriously, your ears will start to really hurt and you'll not enjoy yourself if you're not careful. Earplugs will solve that and you can have a great time, even if you might look a bit of a tit (though, saying that, loads of other people will be wearing them, too).