Results of October Book In a Week

I know it's been a while , but I didn't get a chance to post my results of October Book In a Week yet. I had set my goal at 100 pages. The week started out successfully and improved each day. My most productive day ended with 25 pages (roughly 6250 words). I knew that I wouldn't be writing much on Saturday because I had a friend visiting from out of town, but I did expect to use 7 hours in the car on Sunday as a chance to get a lot of writing done.

However, I achieved the 100 page goal on Friday evening and didn't write at all for the rest of the weekend. I guess I should have set my goal higher so I'd kept working on it over the remainder of the weekend.

I just checked the results of October Book in a Week and I was the 6th most productive writer for the challenge. The most productive writer completed 280 pages during the week. Wow!

I'm unsure whether I'll be participating in November's Book In a Week. I have a heavy schedule to get Faceoff of the Heart revised on time, but maybe I'll be ahead of schedule with the revisions by that time and will need to take a week away from it. If I do participate in November's challenge, I'm going to increase my goal again.

What do you guys think would be an appropriate goal for Book In a Week? 150 pages? 200 pages? An entire novel (since November is National Novel Writing Month)?

What do you guys think of challenges such as NaNoWriMo and BIW? Is it a surefire way to burn out? Or is it a good way to boost productivity?