Nick, I had a TC Electronics Harmonizer. It stopped working the day I brought it home. The store wouldn't take it back and TC Electronics wouldn't replace it.
After several re-loads of the firmware to get it working only to have it fail again during the next 5 gigs in a row, and TC Electronics finally agreeing to look at and return it in 6 to 8 weeks, I did a little surgical repair myself and I felt much better. I will never buy another one of their products.
https://i.postimg.cc/MpY0SvyP/tc-electronics-2.jpg