Here in SoCal, my favorite huckster, Bob Villa, has been pitching "Grassology".
Basically a water hose powered grass seed broadcaster.
The grass seed mixture contains some rye, some fescue, and some Kentucky Blue, AKA: basic starter grass.
No Merion, no Windsor, just Kentucky Blue.
Don't remember if any fertilizer is included.
Villa extols the superiority of his "sheep dip", and the ability of it's root structure to penetrate deeper than conventional grass seed into the soil.
IOW, he claims that his "sheep dip" will do a better job of penetrating the hard clay and rock commonly known as sub soil.
Maybe.
What makes this so funny is that SoCal is basically a paved desert, so grass is the last thing needed here.
Matter of fact, the DWP (Department of Water and Power) has an ongoing program to pay it's customers a rebate for every square foot of grass that is removed and replaced with drought tolerant desert landscaping.
Just another example of let the buyer beware IMHO.
Lew