Gibbons Pass west to east is worth the effort. In fact, based on what [MENTION=187637]BobG[/MENTION] has said any my own experience, I would rather climb than descend the west slope. The only reason I didn't ride it again last year was because it had been raining in the Sula area since late afternoon the day before and had only stopped that morning. Wasn't interested in riding in a mud puddle.
Shame about Old Darby Rd. It was in very good shape when I rode it in '11, '14 and '16. Much better views than U.S. 93. The first two were on Old Darby. The third looking back while climbing the west side of Gibbons. The wide-ish angle of the lens makes that slope look more gentle than it is. Wipe out and go off the side there and you are toast.