Sure, I own
scubapro regulators and my wife owns a
zeagle BCD. Both are made in China, and both are pretty good. There are very few brands that make stuff outside of China right now. Even fewer that make stuff in the USA.
I think you probably meant stuff like "no name" Chinese gear such as the various dive lights I have from fleabay. I have bought several. They tend to be lower quality but have served me well. For the difference in price, I could treat the Chinese lights as disposable and throw them out after every dive and it would take a very long time to add up to the price of the "American" version. I don't do that, I maintain them and they have so far held up for the most part. I did have one of six various lights that I've ordered from china crap out on me. $30 down the drain.
If you do get cheap Chinese stuff like lights make sure you disassemble, inspect, and maintain it even before you dive it the first time. They're famous for doing things like not lubricating o-rings on dive lights or including damaged o-rings. Check that stuff out before hand, lubricate your o-rings, tighten screws etc...