I did it last year, it was nice. Really hot, so be aware. I have to say the "Nasty" ain't much compared to some daily rides her in New Mexico, so fear not.

As far as TNT goes, I wish I could have had a better experience with them. I participated in 5 centuries last year, all of which were big events for TNT. I was not a member, and cannot speak for all of them, but they were some of the most obnoxious riders I have ever ridden with. They screamed at slower riders with me, one of which was a cancer survivor and who's chemo made it difficult for her to judge distance, and were course bully's. I know it's a good cause, but these boys acted like they were Lance, which they weren't. What a bunch of posers.
I know I'm going to get a bunch of flack on this...