Four or five players is great. Ive been running it for about a year. The first module or two may be tricky, but if you are smart and careful (and the DP isnt blood thirsty) you will have a great time. I am running a group of five and honestly, with even one or two optimized combat characters, the content is a bit... easy at times. I have to boost it to challenge them. PS... I would love to play, but thursdays are a WoW raid night for me, and I am, as I said, already about a year into the campaign as a DM, so I know it pretty well...