Brief report:
Climbed with Sam Mills.
We did it in 4 pitches as we solo the class 4/low 5th section to gain the arete proper. Started walking out of Gayley camp at 5:10AM and made the summit by 10:15AM. Excellent weather! Also, ran into SP'er graham at the summit, who came up via the North couloir. Left summit a bit after 11AM and were back to camp by 12:40PM (7.5 hrs camp to camp). Then, packed up and left camp at 1:30PM on the slog-back to the trailhead getting there just before 5:00PM.
Additional info about climbing Mount Sill can be found here.