I have been in the business for 8 years and we have had great success aerating the lawns double over and then over seeding the lawn with a push spreader. Some lawns that are mostly bare sometimes only grow in where the holes were made from aerating, which can be frustrating. I been looking into buying a slit seeder for a few years now and was just wondering what others thoughts are. Is it worth the money to buy and use for these bare and mostly bare lawns? Do you use them for every lawn when over seeding? What model would you recommend for purchase that is budget friendly?