I personally own 2 of them and have not had a problem with either. I have recommended them and have only heard of one with a problem. The person with a problem said they sent it back and got a new one from Jasmine in China. I had one of their headphone amps that was damaged in shipping. They replaced that one with a new one. From what I can tell, they have been responsive and the units have performed well, in fact, better than units I had that cost 3 or more times the cost. The only problem with sending it back, of course, is the shipping charge. It seems like it is less expensive for items to be shipped here than for US to ship to China. I wonder if the Chinese government is subsidizing shipping from China to make their products more competitive.