I have been using Flying J for 15 years as dedicated as I can be . On my last trip 5000 miles I had to use whatever diesel stations available .they were cheaper ,faster ,They would just turn the pump ...
I still use FJ from time to time. I don't think they are as good as they used to be since the merger (take over if you like) with Pilot. I have been in some really good ones (Rock Hill, SC), and some REALLY bad ones (Pecos, TX).