Quality isn't great, but what do you expect? It's good value for the price.
it was pity for me when I found the one output don't work. But it seems like easy to fix, I get the sound when connected to the pin right before the green connector. It works good. I tested amp with 12v/2A and a radiator was pretty warm. Who tested this amp with full 5A, is the radiator hot as hell, or norm?