new version of Asacol (HD - take less pills)

I had to go off of Lialda due to headaches and am curious about this new version of Asacol. I like the idea of taking less pills!! But I'm curious if I'll experience the same side effects (headache) as I did with Lialda. I had the rare experience of sitting in a room full of GI's today at a pharma rep presentation of Asacol HD (has to do with my job as a caterer). As it was my own docs office, they invited me to stay for lunch!! I got to ask some questions and they all agreed that they rarely, if ever, hear of any side effects from Asacol. Just the dread of taking so many pills, which the HD seems to have helped with.

I'm also taking 6MP. Dr. said I don't necessarily need mesalamine but it's been shown to be a cancer preventative so he recommends a low dose, which was news to me.

Anyone have experience w/ the asacol HD?