No doubts on Slippery Rock. It seems to me that all the Pennsylvania courses I've seen (championship courses) are a bear. D2 regionals 1985 were held in East Stroudsburg and that course just punished me. Think I ran 41:00 or something ungodly glacially slow to finish about 10 places behind last place. At least it felt that way. Honestly, I felt like I was on that race course for about a month between the time the gun went off and the time I found my way back to the finish line.
Hardest course I've seen since I started coaching last year is the one we ran last weekend at Lyndon State College in Northeast Vermont. There are a few "easy" sections through the woods, but nothing flat other than the section around the start/finish line. That area is about 200 meters long, but it's on a sidehill. Total elevation gain isn't tremendous, but this course never stops coming at you. Footing is ok, roots and rocks but nothing outrageously dangerous. The lower loop goes through a mud bog with a couple of wooden footbridges that are partially gone. Lots of changes in direction for the whole 8k. It's a tough course physically, and also mentally because there's a lot of single track sections.
Real XC...real Vermont XC :-)
Lyndon's a top 20 NAIA school. Their coach told me that they've had 1 guy run sub 30:00 on the course the last few years. He's a 26:00, maybe slightly faster, runner, and holds the course record of 29:something. That says it all.