Ready to spray weed killers are a great option for taking care of smaller amounts of weeds. They still work on large amounts, but it’s much more cost efficient to use a concentrate in that case.
For smaller lawns (5k or less) I like to use the hose end versions to knock down a large variety of weeds at once. Then after that I’ll use a version with a hand held wand or trigger.
What I really like about ready to spray weed killers is that they are self contained. You don’t have to mix anything, and you don’t have to clean any equipment out after. They are convenient – you can start using it today, put it on the shelf, and start using it again a week later.