Turn onto Circle Park Road and the dispersed camping spots start about a half-mile down an easy dirt road. The road is about 3 miles long and ends at either a campground or a trailhead parking area depending on which way you go. The campground is paid, but the entire access road (Circle Park) is dispersed. Multiple off-shoots of various dirt roads, most accessible with 2wd, some requiring more.
About a mile from the entrance is where the "established" dispersed sites start, you'll easily tell by the gate entrance. It was open, but does appear to close occasionally. The first fork you come to you can go left which will require 4wd, or you can continue right on the road. About another mile or so you'll reach the second fork. If you go right the dispersed camping ends and the entrance to the campground begins. If you go left it ends at a trailhead, but has some great dispersed spots before that. No matter what vehicle you drive there are multiple spots for you to enjoy.
A decent amount of traffic due to the campground, I saw about a dozen vehicles an hour on average until the sun set. Cell phone reception is hit-or-miss depending on your location and carrier, Verizon had 0-1 bar of 4g where I stayed. There is water available at the campground if you absolutely need it, though I would slip a couple dollars in the self-pay box as a thanks if you do use it.
Lots of awesome established and rough trails depending on what you're looking for. Lots of birds, and there's a couple of fox families living in the rock formations.
It can be a bit noisy depending on where you stay, but the mountain views during sunset are absolutely stunning. I wouldn't hesitate to stay here again.