For international customers IMO the real issue is not the relatively high failure rate of these amps (although I think it's a valid question why such simple and low wattage devices fail at all), but the fact that Drop only ships replacements upon receiving and verifying the faulty unit. This takes about 2 months (from personal experience, way before the pandemic). Drop is also unable to provide any technical support or parts replacement, so you wouldn't even be able to pay them to fix your unit.

Between this and the Drop panda which similarly died randomly after a few months (to Drop's credit, in both cases they accepted a return and full refund), I decided never to buy any Drop electronics. Sure miss the massdrop days when they were offering all sort of interesting stuff from established manufacturers at good discounts.