I did it a few years back.....had a GREAT time. Lots of alone time on the track, if that's what you need. You only get a few laps in......but it feels like you're riding forever. The only bummer, for me, was giving up north T7 , but you get pretty much everything else.
I'm already signed up......hope they don't cancel like they've had to the last few years. It's been said, "if it doesn't happen this year", due to low interest, "I'm done, I won't try to make it happen again". So, if you're thinking about it, it may be in your interest to go for it.