I'm a bit put-off by the marketing hype at their site. Claims a 'PhD' in park flyfishing but only deals with dry flies?! Little streams [falls, sporadic plunge pools and/or high turbulent water-that especially in bigger watersheds] is NOT prime dry fly water. Regardless, it's a limited approach -and even contra-indicated. There's simply more food AND feeding underwater than on top. No argument with dry fly purists [fish anyway you choose], just don't claim it's the only way. I DO give him credit for making this plain up-front-saved me some money.
Granted, one may choose to throw bricks tied to a piece of poly ski rope as a means of 'fishing' -just don't claim it's the 'Phd quality method' :-). Ghost