I have wanted to try this for a few years but just put off and tried my own way. What I would say is this really did work faster and better. Even though I seeded end of March with the good spell of weather but cold night temps it started working in 2 weeks. The results by week 4 have been amazing. A few patches that I may still reseed in a few weeks if still there but these are known problem areas. The grass is so thick and lush now. If you've put off buying because of the price, like me in the past, use this as a sign of someone who tested for you.
P.s. my garden this time of year is shaded until after lunch so not lots of sunlight in spring so again really impressed but next year may wait until end of April rather than March but I was too excited to get going!