Gray,
I have a six foot Harley Rake, made by Glenmac, the pro version, with the double rollers, hydraulic angling and the retractable scarifiers. These rakes do many more things than just groom for new lawn installations. I have graded hard packed drives, spread process, spread crushed stone, and groomed ball fields and the end result is always fantastic, once you have used one you'll never want to use a hand rake again! I know that woods and some other companies are making the same style rakes as Glenmac, but as far as service I don't think anyone can hold a candel to Glenmacs service, if you have questions you can call em' up and get answers from a real person who is more than willing to help, and they will also happily sell parts to you directly, and their primary product is the power rake. Hope this helps.