I attended for a short time, but had to drop out due to a conflict. Have you studied an inflected language before? I think this and a good memory are the best assets to be armed with when attending. Lots of people couldn't keep up with the barrage of information that one is hit with daily. It's constantly jumping through mental hoops for 3 hours and then another 3 or 4 after lunch. You get called on a lot and there are quizzes.
Most people I knew studied until the wee hours and made late night calls to advisers (who were on 24 hour call when I was there). This is HARDCORE. Don't attempt it unless you're sure you a) have the time to devote to it and b) you are intellectually up to the task. There's no shame if you aren't able to do it — Latin can be acquired in the usual way over a long period of time otherwise.
Think of it as a Navy SEAL boot camp for classical languages. I am not kidding even a little.
The cool thing is people like Rita Fleischer (co-author of Intensive Latin) are there, as is Hardy Hansen.
One guy I knew was taking the Latin with me. He had taken the Greek section a while back, maybe ten years before. Three weeks in during the Greek course he was a basket case — he was failing tests and just lost in the material. Then suddenly a lightbulb went off and it all started to sink in. He survived and got his "gentleman's B," which I understand everyone gets after successfully completing this course.
My experiences are from the summer of 2003, but I can't imagine things have changed so much.
Let me know if you have any follow up questions. Good luck.
Given the choice between accomplishing something and just lying around, I'd rather lie around. No contest.—Eric Clapton