We generally like them, especially for the 5c/gal discount with the Good Sam card. The gas price before discount is usually the lowest in the area. Both FJ and Pilot stations are often jammed because of that fact.
We especially like the Flying
Js with an RV island. Sometimes, rather than wait for a pump we can easily get in and out, we'll go across the road to a station that has a higher price and no customers. We picked up a free guide that tells which ones accept the discount card, which ones have an RV island, etc.
We leave the overnight parking to the trucks. If we need an overnight place, we'll find somewhere else without the refer noise and the trucks coming and going.
We have used their dump station, and they are usually easy to get to. They do charge for using the dump station.