I was going to ride it last year, but the guy I was going to go with said he wouldn't do it if it was raining. And it rained.
But I've been in that area quite a bit and it's got some good hills (they call them mountains). They also have some shorter rides (I think 25 mile, 50 mile, a 62 mile, and a 74 mile). The shorter rides don't tackle as many of the mountains. They say the 50 miler is almost flat. The 62 and 74 add a few mountains, but not all that you'd go over on the 100 miler.
It is really beautiful up there. I'm planning on doing it this year for sure, rain or no rain.