Well, I got a very good offer from a polish trials SHOP for a Born CNC stem and have mounted it already. The four bolt clamping is so much better in my eyes and the stem looks awesome. Kinda like Thomson stems which are my favorites*.
The finish of the Born stem is different to the Brother stem. It's not as smooth and even though it's anodized, I couldn't hear any clicking noise from it, probably due to the different surface.
*I wished Thomson made 150x30° stems. I'd pay a lot of money for one of these.