I use and am growing to love BFWD, as well as the Deep Gloss Spray as a maintenance topper.
Now, don't get me wrong or shoot me for this, but I feel the concepts of beading and sheeting are a bit overrated. I mean, no matter how you slice and dice it, any amount of water left on my hood after a rain (i.e., regardless of the droplet size), will likely leave a mark on my Jet Black328i's hood until I do a maintenance wash.
Oh, btw, I am NO expert, just an enthusiast.