I bought two of these VFDs. I had a failure with one and replaced it with the second VFD, which is still working.
I was not able to get a complete refund or a replacement unit.
I was asked to provide a video of the failed unit in operation. I could not do this as I had already replaced the failed unit.
First refund offer was for $38.00 for a VFD that I paid $180.00 for Second offer was for $116.00. I accepted this with a comment that I was not pleased.
This VFD is very limited on what the display can show.