Certainly a good device on the one hand (there are almost only good reviews for it), On the other hand ... Vorsicht..wer the handling and use of such equipment is not used. Even at the lowest setting of simple aerator knives ... tearing the roll, so to speak ... without mercy, one remains unintentionally too long in one spot in the grass ... you've got a hole in the lawn. Not only the moss, as an example, is gone, but the grass and the tiresome overseeding is necessary. In my opinion and experience, as a longtime hobby gardeners, would be a better ... "gentler setting option" ... without manual aerator having to use rakes, necessary for this type of equipment. What's the one too little to effect, is the other too much.
Would it be because of health condition reasons now unnecessary as the need to use a device, I honestly would return to my manual Handvertikutier rake again. The hand was raking swaths friendly and had a good effect.
For a complete refurbishment and Neuanlegung a grass / lawn, depending on the square meters of space is a device to be recommended, however.
Wait, and outstanding in the test remains the fan roller, how the fans claws / needles ... regarding wear and damage behavior in a very heavy solid clay ..zb if it had not rained before.