@studio had a bad time with them a while back:
which lines up with the reports I have read elsewhere. I remember there being other complaints too but I don’t see them at the moment.
I had a bad experience with one of their products (BH250, arrived defective) but I RMA’d it to the store and they dealt with TC. I got refunded no problem.
I’ve posted elsewhere that for their newer products I treat them just like Behringer (their owner); some great gems there but your warranty is basically buying a replacement if the first one breaks.
I’m really happy with my TC Nether for what it’s worth. But I would assume any customer service call will go down like it did for @studio.