I put my current Astra blade in the Slim, which was set to one -- it's mildest setting. I lathered up and took a patch shave -- that is, one and only one lathering; shaving in small patches using slower, longer buffing strokes; and each patch being shaved in at least two directions.
I found the experience and outcome to be similar to using my venerable Merkur 33C Classic razor.
In fact, this shave was so satisfactory that I'm keeping the Slim and have re-thought my selection of razors on hand in my bathroom drawer.
The razors that I'm keeping at hand are the following:
- Gillette Slim Adjustable
- Gillette Tech (c. 1948)
- Merkur 33C Classic
- Merkur 15C Open Comb
- Rimei RM2003 (slightly too aggressive to be perfect for my face)
- Lord LP1822L (blade-bar span just a bit too wide to be face friendly for my contours)
- Weishi 9306-F (just too mild, without the corresponding uber gentleness on my sensitive skin)