PCB lights were my primary lights for 15 years. Multiple AB’s WL, and Einstein. I used them in a low-volume professional capacity and never had a problem. Never needed to send a light in for servicing. Zero issues. They just work and they worked consistently.
PCB customer service is outstanding.
Anytime I was in the Nashville area (I lived in Atlanta at the time), I would run by the warehouse/office and buy something. Terrific folks.
That said, I would often want to get a modifier very close to the face of a model. I did become concerned about a flash tube possibly shattering and having glass flying about and potentially injuring the model. Is this a valid concern? Maybe/maybe not —- but I did get concerned. That’s where the Einsteins came in for me. With that Pyrex dome, I figured that in the unlikely even that a tube did shatter, the dome had a good chance of keeping the glass away from the model. I would use the Einstein for any strobe that went a few feet from a model’s face and use the WL/AB’s for fill, rims, ….. whatever else.
All that said, I never did have a tube shatter.