Works, but there are buts
It works exactly as stated (about the longevity time will tell) but think twice before applying, it doesn't make things only better. The car tends to suffer more from morning condensation (and also frost), forming a thick layer of water that doesn't dry off for hours after all other cars that did not get this treatment are already completely dry (because of the beading). If you need to go somewhere early morning in cold weather, your side windows will take forever to dry, the fastest way to get rid of it is to just get going, the water then sort of flows down when you gain a bit of speed because of wind, but that includes a minute or two of driving with basically opaque windows.