The part of his design right, and qualitatively there is nothing to complain about, he pushes himself through a kind of quasi flap always even some millimeters further. Through the gray fringed "suction mouth", he is on flat, with hose weights it can also balance out well, so it is not too flat or too steep in the water. The hoses can be in meter pieces join together precisely depending on pool size. Unfortunately you can not lump tell if the cleaning performance is bad, good or very good, because it primarily depends here on the capacity of the existing pool pump. The pool cleaner is plugged in directly to the Skimmerabfluss toward pump: here is the water flow rate low, is no suction on, he then cleans almost anything and continues to move very slowly. Talk to a pump having a throughput of less than 4 m³ / h, you need not expect too much. Since you have but with each pool cleaner who works on this principle - that is required for vacuuming the pool pump - the same problems. Thanks to German instructions Assembly was not a problem, the parts are simply plugged into each other. Moreover, the pump should better have a pre-filter, otherwise you have to hang around all sucked Schlunz equal to the sand filter and you have to look at how you get the sand clean again, ie Backwash forever.
