Took a plunge and signed up for this year's season. I like the concept and appears they tailor to your area's soil. Not a huge fan that it needs an application about every 6 weeks but apparently liquid soaks in a lot quicker.
I did the total care package without pesticide. So it includes a green up formula, herbicide, and a patch/seeding mix to fill in some dead spots. There's also a soil test kit to send back to them.
Then it includes treatments into the fall. I want to say 4-5 applications. Estimated 9,500 sqft lawn. ~$375/year.
Doing the math, with the increase in cost of granular fertilizers, it's not THAT much more than an annual neil sperry plan.