I had a very difficult time getting my grass to grow in my backyard.  I used a whole 50 lb bag on 5k square feet and the grass grew in very thick.  I know this is extreme overkill but I had it by that point.  The grass is very fine and soft.  I would recommend this product based on the price, quick germination time, and overall look.

We have a new yard and the contractor hydro-seeded May 2014. In August some places needed additional seeding. We selected this grass, and within a matter of days it looked great - better than the grass from May! However, by October this new grass began to die off. Now that is it May 2015, all the areas where this fast growing seed was used 100% dead, while the contractor planted grass is doing fine.