My GF and I did the Ride the Hurricane 2 years ago and had a great time. Price is very reasonable and they had one support stop along the ride and plenty of food at the top. Being able to ride without car traffic was great. We had fantastic weather, it was cool in the morning with cloud cover but we broke through the clouds a couple of thousand feet up and had spectacular views of the Olympics.
Climb is as mentioned above a steady grind, the toughest section was right as you enter the park. It's a little steeper and the road is a little rougher. Some folks started at sea level to get the extra climbing in.
We drove over the day before and made a weekend of it in Port Angeles. Plenty to do out there but the drive is a bit of a pain for a day trip.