For the first time in my life, today, I climbed Ardsheal Drive in La Habra/Hacienda Heights (not sure which). I've tried it a half-dozen times, each time I've either turned around or had to stop. It was... a ***** and I had to weave across the road for the more aggressive parts of the climb, but I effing did it.
For what it's worth, I would rather do hill repeats on Turnbull than climb Ardsheal. Ye gads.