After reading test reports I have chosen for the unit. Saturday ordered from Amazon, delivered Monday. Unfortunately there was one of the four mounting screws for the handle. Luckily, I still had my old Scarifier, of which I was able to reduce the screw. The new device works perfectly, is easy to use and has a low weight. That the wheels must be individually adjusted to adjust the working height is to cope with the low price. Finally, a cost also as "good" tested unit of Gardena threefold.
The grass catcher is a bit small. I guess it takes about one-third of the plucked material on. Or just empty every 10 meters.
Conclusion: Except for the missing components all right.