Have installed many Mahle components over the years to my vehicles including their oil filters.
MAHLE oil filters purchased have always been well manufactured, good moulding around the rubber silicone seal, and the filter paper; when cut open after using to see what the quality was like and the metal swarf caught, sad I know; but helps to determine a product, has always been evenly distributed across the filter with no unusual gaps or abnormalities.
Cannot speak to the quality of the filter paper, however given Mahle are a leading supplier of components to some of the heavy hitting vehicle manufacturers, which have in house testing facilities the quality must reach a consistent and reliably effective threshold.
All in all I have no hesitation in recommending Mahle products, having fitted this manufacturers various parts available to my vehicles for over 25 years, and whilst only ever having to return one part for replacement a lower wishbone balljoint in that time.
This filter has an unusual valve arrangement which makes it impossible to prefill it prior to fitting.
Probably a superior filter but I won't be using on my old engine.