We intended to stop for a day or two, wound up staying the week. The park is nice, the facilities sound, the area is at a traffic circle, but not overly noisy. The proprietors are friendly and helpful, and prices are reasonable.
We got a full hookup in a pull through which worked out fine, and got some much needed R&R from our long trip through Yellowstone. The Lazy J is right across the street from a nice supermarket/ general store/ gas station.