One of the reviews for this razor states exactly the same as you have said, multiple passes and stubble still there.
The suggestion was to use aDE razor.
I have used Feather blades and they are exceedingly sharp. I have since started using DOVO blades, these are very sharp but they maintain a sharp edge for a number of shaves. This with very tough stubble. Smooth shavew and comfortable.

    Maybe one of the cut throat ones are very close like barbers use for trimming round head when doing final exacting.

    Having tried everything and been somewhat of a collector of vintage Gillettes, cut throats and all sorts I have reverted back to a daily shave with the Merkur 34c HD, and a selection of DE blades. Often touted as a beginners DE razor but anything but, very very accomplished. 2 passes is babies arse smooth.

    Elcarajillo One of the reviews for this razor states exactly the same as you have said, multiple passes and stubble still there.

    After having shaved with the Feathers and being left with a very poor, patchy finish I shaved again with my Gillette 5 blade Fusion and it gave me the finish I wanted, baby smooth…..….so, many thanks to Frank aka @Elcarajillo and @wintoid

      dfk41 have you been naughty and put in detention to do lines?

        Elcarajillo I use feather blades in my feather DE razor. Although the blades are insanely sharp, I have not cut myself yet. The razor tames the blades. I can’t imagine trying the blades in another razor. I would cut myself so much.

          Loonster
          The feather DE razor has relatively low gap so that mutes the sharpness of their blades. It is a good combination though if one wants to cut through a lot of growth one should go for a higher gap DE razor. My own favourite razor is probably the Wolfman that comes in various gap specifications - its fit and finish and craftsmanship are on a very high level that few boutique razor makers can even approach.