I'm with Stackpole. I like 10 pages MS format both as a writer and a reader. Shorter chapters and I feel like I've artificially inflated the word count. Longer and I get hung up. (I will let a chapter go to 12-14 pages if necessary, otherwise I look for ways to split a scene.)

As a reader, my reading time is very limited, shorter chapters keep me from stopping mid chapter and never going back to it.