Looking at the Blue bird web site it would appear that the Bluebird power rake is the better unit for dethatching. What is different other than the hopper on the S22 vs. the power rake? I'm not really super hot about offering dethatching since it's very labor intensive and I'm not sure if it will be profitable due to post clean up and hauling of thatch. In my area it's a spring event. hardly anyone does it in the fall. Can the dethatching blades show below be used for the S22 Has anyone used both units? Pros & cons etc.? I'd really rather stick with offering over seeding alone . . . but if thatch is excessive when you overseed you have issues. Correct? Wisdom from veterans much appreciated.