I picked up a Weck hair shaper the other day after researching a Weck Sextoblade (still looking for one) shaved with it today.
First of all- SIMILAR to a straight razor yet subtlety different. Angle is slightly different and much keener than any straight I can remember using. I was surprised at how smooth it was- I was expecting a harsh feel but it glides over my face.
Since it was so smooth it was easy to get over confident. The blade is so sharp it sliced through the imperfections on my skin (didn't feel it) rather than avoiding them (for lack of a better word) like my coticule edges.
Lots of weepers! Nothing I couldn't handle and OMG the feedback from the alum was strong. Result was a 2+ pass BBS but at some cost.
Just thought I'd post in case others are considering using one of these.
A bloody good shave