Sounds way too good to be true ...is it? If not which one is the best?
All the grasses I know of grow and grow. Some grow faster than others and need to be mowed less frequently. Those are the ones they call "no mow." Look for a dwarf variety of the grass you want. For example Marathon, Marathon II, and Marathon III are all dwarf varieties of fescue.
We used NoMowGrass from Http://nomowgrass.com
It grows about 4 inches here.
We had some weed control to do the first year and they recommend cutting it once a year to help thicken it.
I couldn't be happier with the low maintenance!
Here is a link that might be useful: No Mow Grass Review