Looking to buy a used one. I own a mantis with the spring tine attachment. It works very good for small areas, but it gives you a workout pulling it backwards on larger lawns. On bigger properties I've always rented the flail blade type of dethatcher so I know how they work. So how does the walk behind spring tine thatcher compare to the blades? I can find them preety cheap on craigs list. Are they comparable at all. Never used a walkbehind spring tine.