Overall, this trip was pretty solid. It was a lot easier to find a campsite (or campsites) on the illinois than my previous trips on the Fox and Dupage. I'm not sure why the IL doesn't have the steep banks that the fox and Dupage do. Also not sure why the IL isn't as heavily forested and overgrown like the others too.
While 15 miles a day on the Illinois would be much more challenging since there is no flow, the abundance of campsites almost make up for that.