We've had innumerable bad experiences with German toilets. In Berlin, we lived on an upper floor and the water pressure was too weak to push a healthy-sized log off the shelf. After a few minutes' fruitless flushing you'd be forced to grab a wad of toilet paper and give the horrid thing an encouraging nudge. Then followed a lengthy bout of brushing and cleaning to remove the skid marks from the porcelain. At the other extreme, in Munich we lived in a basement suite where the water pressure was too high. Worse, the shelf was actually slightly concave, forming a shallow bowl. The first time I flushed the toilet the water came rushing through so forcefully that a small chunk of poo launched off the lip and shot out over the floor. After that we always held the lid down when we flushed. I swore you could feel a kick as the turd ricoched off the underside.
SDC