I live in CO now, and love it, but used to live in the Midwest. I miss those rolling trails! My local XC races have a very different profile.
The downhills are long, but not very technical (in the MTB sense; lots of fast turns tho, so what roadies would call technical ).
The fast guys are running either a short travel full sus XC rig, or a XC hardtail. For slower, older guys like me, the long downhills are easier on a rig with a little longer travel. The dropper also helps - about one-two inches makes a huge difference on the fast descents, making the bike easier to move around.