My experience so far concerns its use as a dethatcher, that is, using the "roller" with the "teeth". It lifts the grass upright and cleans the ground very well from leaves, twigs, and materials that obstruct the flow of water and fertilizer components to the roots. The bag, although small, does a very good job, collecting all the discarded materials. I recommend using it in combination with a large garden bag (e.g. from Lidl). The lawn, one week after the aerator application, is upright and noticeably cleaner.
I still have to use the roller with the "blades", that is, as a scarifier. This will be done in September, partly to avoid shocking the lawn in anticipation of summer and partly because the "grooves" that will form in the ground will help with the overseeding I plan to do.
Overall, the machine is very good, with good build quality. A big advantage is the 2 rollers. In other companies, the second one needs to be purchased separately. The bag is also useful.
Those of you who have warm-season grass, consult a professional for the use of the "blades".