The good news is Massdrop has jumped in will be shipping out a replacement in next 1-3 days and then will print the prepaid UPS tag to return the failed unit.
So hopefully the new amp will last for a long time.
Support for this product is 1st class. I've had a minor unrelated issue with my THX 789 amp and support was first class.
This 789 amp is something special. Insanely great. I have it paired with Pro-Ject Pre Box S2 DAC.
I'd never purchased anything from Massdrop before and being on the other side of the world, I was worried support would be an issue. And I read some comments about channel imbalance.
Both fears have been squashed - very very happy.
If there's a followup with remote control and maybe digitally controlled analogue volume, I'd probably still upgrade just to feel warm and fuzzy inside. If there's no followup to this one, I'm already so happy, so no problems.