Used them at a few courses I have worked on. We focused on areas that were not being mowed that day, had poor air flow, and therefore would otherwise have dew into the afternoon (Mississippi River valley courses). In your situation, with longer cut KBG it may be worthwhile to either spray a preventative fungicide during your more stressful months and/or use something like Dew Cure. One thing about Dew Cure is that you will know without a doubt how good your coverage is when you get a dewy morning. For me, pivoting around a garden hose weighted down at one end or fungicides are my go-to. Cutting down leaf wetness time is very important in a disease management program - depending upon your overall pressure.