Here in SoCal, my favorite huckster, Bob Villa,
has been pitching "Grassology".
Basically a water hose powered grass seed
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.
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.