I've ridden it. It is part of the Heartbreak Hundred (both single and double century). I have also ridden it as part of a loaded tour from Palmdale to the central coast. It is a nice road with a couple of steep sections known as the "Apache Saddle". There is a general store at Pine Mountain Club to re-supply but take lots of water, ther rest of the road is pretty sparse. Beautiful views looking down into the valleys. Here's a link to the Heartbreak Double website for a little more info:
http://www.planetultra.com/heartbreak/index.html
HtH - Jim