Williston vs Sweetgrass
Clearing at Williston no problem, oil boom will only affect you if you try to find a room in town, none to be had.
Sweetgrass strip is a bit rough, ask them what current conditions are. Last time thru there it took us 1.5 hrs to get processed, dogs, airplane tear downs, ride to border station in blacked out Suburbans, every form imaginable, etc. They get so few planes thru there they decided to use our group as a training exercise and gave us the full treatment! They were very friendly after they cleared us...
Cutbank OK if you followup with call 2hrs before arrival, no permanent agents there so they have to call somebody in.
Great Falls always good. Continue SE and fly by Devils Peak on the way to the fly-in.