The Biria is nifty in every way. They got a bad start and a bad rep with an initial batch of frames with incurable alignment issues. Easy to imagine that jigging up that frame first time there could be some issues. That was about 15 years ago. Bad first impression is a real problem. The frames have been very straight and all details sharp for quite a while.
Also they are more normal than you would expect. For example when I did the 150mm crank on my old friend's bike it was a basic Origin8 crank and the only thing to do was try and see. I could not figure out how to measure anything on that strange frame. The new crank bolted up on the OEM spindle and chainline was perfect. Most things on that bike are like that. It works.