After about 2 months of use they have, as expected, still not shown any signs of wear. The mixer lever is as pleasantly smooth on the first day.
Very positive was the easy installation, even with the rather brief instructions I got along well. One can decide to have what swivel region of the outlet (360 degrees, 150 degrees and zero degrees) for three variants. Therefore, the outlet is not permanently mounted, but we only after inserting an intermediate piece (which the swivel range specifies) used.
The dismantling of the old - visually very similar - mixer (from Ikea) was much more complex, it was because that and the retaining nut wrench was not attachable. At Grohe system hoses are flexible, however, that all this was not a problem. With little effort, was the mixer "dead certain" to screwed.
So strong buy recommendation.