I have actually never done NaNoWriMo, but I have published a novel. I've always been interested in NaNoWriMo, but the thing that gets me about it is that it's all about quantity instead of quality. Yeah that makes it fun, but I'm waaaay too much of a perfectionist to be okay with writing hundreds of not-that-great paragraphs and submitting it for a prize. Still, I might just be able to get past that and try it some time just for the fun of it....