I take Amir's point, but wouldn't you need to know how old the ML amps are to put what you quoted in context? If those amps are 5 years old, that's one thing. If they are 15 years old, it seems a bit different. For me, if I buy something for a few hundred bucks, considering it disposable makes sense unless its broke out of the box. If I pay a few thousand bucks, that changes and it would be very important to understand whether real support is available for Chinese (or any other) gear. If the option is shipping it back to China, I'm not sure I'd consider that real support. I assume some of the higher end Chinese products have service centers in the US, but I don't own any of it, so not sure if that's common.