Has anybody bought or heard a Chinese knock off amplifier?

I can't take the time to read all this but, there is good stuff made in China by very reputable companies; I own an Auralic Aries G.1 .
There are fakes and weird stuff. Painting with a broad brush is never fruitful

There are people that buy Prima-Luna amps and pay good money for them, whats the difference ??  I have people send me amps to repair all the time from Chinese manufacturers, try to get a on-off switch or a knob or any help with diagrams.....I tried to repair a very popular Chinese amp not long ago and couldn't get a diagram or any help what so ever.....So I've decided to not repair any non-American amps.......So when you buy a Prima-Luna amp make friends with Kevin , he might fix it for you.........W

I have bought many China electronics. I have learned to use Google chrome translation on the China Taobao site and other Chinese reviews. There are cheap knockoffs and there are VERY good ones. Unless you know the language or spend time on the Chinese language sites you may never know. For the most part the ones on Aliexpress are the better ones but the best ones are only on the Chinese language Taobao.

I have very high end original equipment and some of the best clones. The best clones sound incredible but are slightly different from the exact sound of the originals.  Unfortunately there are some real turds as well as outstanding products as well. Most are modeled after discontinued products though which probably circumvents the issue with copyright. The Dart Zeel boards are 100% exact circuitboards and the component choice and device matching it what will seperate the original sond from the clone in absolute terms.

What about Magnetbox, Panaphonic and Sorny ?
https://www.youtube.com/watch?v=guck4FoWQss

I have some experience in this area--not much, but some.

First off, true knock offs--posing to be something they are not--are not too common. There are clear examples, like Mistral’s B&W knock offs.

In my view, most of the China HiFi market is made up of four types.

1) clear knock offs--not that common. I define this as something that says it’s a Mark Levinson amp--not a cloned circuit.

2). Clones/Kit Using Legendary Circuits.

3) Discrete New Products. I define these as Line Magnetic, Doge Audio, Cayin, Willenston, Denafrips, and so on. These are organically designed and made in China products with strong corporate back stories. Also, these products use high quality components and should not be judged without listening or "popping the hood". The quality in these products is near exceptional.

4) US/Canadian/European Companies. Many household name companies design their products in their home sovereign then build them in China, under contract with a factory. The list of these is massive.

As to the OP’s question, I have heard some clone amps. I heard a Mark Levinson clone and a couple Pass clones. A friend built a Marantz clone from a PCB sold by China-HIfi. All were pretty decent, but of varying quality. Some of them are really, really nice. I think ones that use a tried and true circuit from an older product--e.g., Citation, Marantz M7, etc.--are pretty decent. Those products trying to be a facsimile of a product (see clear knock offs), are less likely to impress if compared to the real thing.

I hope that makes sense!