I recently bought five rolls of Eastman 5222 (Double-X) from here
https://www.ultrafineonline.com/ko52doxblwhf.htmlThe price was cheaper than Cinestill or the Film Photography Project.
I shot and developed my first roll and it had repeated bands of exposure across the frame with clear sprocket hole exposure marks. The camera has not had any such light leak problem with any other roll of film.
So I wrote the company, explained the situation, and sent them a pic of a section of the negative. Anyway, been having an extended back and forth with them where they insist the problem must be with my camera (despite my repeatedly telling them only their film presented this problem in my camera). They suggested I shoot another roll in a different camera. I asked why should I waste my time doing that. I'm not their quality control tester. I suggested instead that I send back the remaining four rolls and they can do all the testing they want. But I want nothing to do with their film and I also want a full refund.
Anyway, they continue to insist it's not their fault. They are obviously not a vendor that cares about customer satisfaction.