In full sunlight, the delivery rate was very high and had to be adjusted (via a simple rotary switch) -whether the pump actually creates the named values, I have not measured it, but they think is realistic.
My water was not very well filtered, but the pump is running perfectly so far - as I had expected even with a premature cleaning - very nice!
A similar model costs at the hardware store to 45.- Euro - therefore one can safely access hereunder 30.- incl. Shipping.
Who a large water Art à la mansions expected gardens here should double check his budget ;-)
Update: After more than a year, the pump is still running reliably.