There is no real weight in the unit, though it is true the points are sharp. However the two do not combine to alow the unit to penentrate the grass / soil. So you either take the unit for a walk up and down your lawn without aerating it (as per photo), or you hold the handle above the roller to push the spikes in.
I've now ditched the unit and am 'moving up' to a hollow plug aerator. At least with that a) you know you are truly opening up the lawn structure and b) as the design is similar to a fork all the downward effort is used productively.
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