I have been subscribing to the quarterly supplements for around 2 summer seasons. I kicked it off with their seed bundle and brutally scarified, scalped and found a local garden service firm to hollowtine both lawns for me as a perfect start! Year 1 I used a top dressing mix in conjunction with the root fertiliser, seed enhancer, grass seed and all the great products these super people provide, then just stood back and watered regularly. The results are amazing. Year 2, I used just top soil to try and level the front lawn and make it more even, again I did the hollowtine and seeding process with even better results. I can honestly say that the price you pay for the products you get in return are both first class. Just remember that you only get back what you put in. I highly recommend the lawnpack if you want a lawn that everyone envies.