I have used an MB brush for years doing spring cleanups. I would not consider it as a "dethatcher" for use on green grass but it works wonders on lawns before the grass greens up in the spring. Also works good on parking areas for winter sand cleanup. Works good on fall cleanups, after the grass starts to go dormant, for achorns, sticks and twigs. I have not tried the Walker unit but my friend liks his.