Depending on your experience level and head-space, this is either an extremely heady "hike" or an easy climb.
This is 99% a hike, but once you near the summit, you will definitely have to do some rock climbing moves. They are easy moves, easier than anything you'd find in a rock gym, but the rock is a little loose. This is the Oregon Cascades after all, where the mountains feel like they are made out of epoxy and kitty litter!
The summit views are tremendous though. Almost all the Oregon Cascades are visible (from N-to-S): Hood, Jefferson, The Three Sisters (this is an excellent place to photograph South Sister), Bachelor, etc. The best views though, are peering right down into the massive summit crater of Broken Top. Bring a wide-angle lens!
Expect this to take a full day. I recommend starting EARLY. (before sunrise) read more