Somehow, this is better built than a generic shavette from ebay that looks almost identical to this.
I used it for months. For the first 2 weeks, I got slight nicks and razor burns.
After 2 months, I could reliably get smooth shaves without burns and cuts.
When I look at my smooth chin on a mirror, I feel satisfied.
After I got used to it, it shaves a little bit better than Edwin Jagger DE89BL double-edge safety razor.
I also have Parker SRX which is similar to this. I'm going to try black widow shavette again.