We had a slow leak in 2015, and both of those shops tried to find it, fixing several suspicious places without resolving it. Last year the problem was fairly imperceptible, seemingly self-resealed.
But Henderson's techs put in a lot of man-hours trying to ferret the thing out while it was there, and added a Safe-T-Plus among other chassis amendments. They charged far less for labor on the leak search than the time actually put in, because they were so frustrated not being able to find it; they even left the coach in the service bay when they could, and went back and forth during pauses working on other rigs.
Many here have said leaks often come down to the type of air fittings used on the coaches, and only have success by replacing them. The hard part of course usually is finding the leak in the first place.
One advantage to Henderson's is, for a charge, they do their Road Performance Accessment by highly experienced techs that reveals handling flaws. The Safe-T-Plus requires centerline tweaking, a process I accompanied the tech on the highway during, and he was pretty particular about getting it right.
Thats not to diminish BCS' abilities, and they likely road test a Safe-T-Plus also. Which facility to use may come down to your getting estimates, and/or which is geographically best at the time. Since both places are about equidistant from me, for chassis issues I would tend to go to Grants Pass, and most everything else I go to Bend.
Joel