I have "only" about 100 sqm lawn, I vertikutiere once a year.
The device runs, Moss tears from the lawn and is sufficient in height. Does everything it should and a little quieter than the "old".
What I liked better the Einhell, the possibility was to bring the handle / rod save space completely on a level with the lower part. This could make the scarifier upright in the corner and he has no more space needed, as the actual device was high.
This is so that a bent rod is firmly connected to the device and the joint with the handle is connected is attached only halfway up (you just see the picture, then understood hers. The orange halfway up the linkage is the joint to fold). This causes the device consumes much more space at the "park" because the rod is always somehow in the way and I do not get it all in the corner.
Nevertheless, for the price a successful device that hopefully survived more than three inserts.
And yes ......... The collection bag ALWAYS is too small. No matter what scarifier Present your. If you look at what is herausgerupft since (at least for me) you would have a small trailer behind the tensioning device so that's enough. Of course, no one wants to even :-)