They've lost at least on case (to Aphex), but the compensation they had to pay was relatively mild (about 300 000 Euros) compared to the 300 something million dollars Mackie sued them over. But they (Mackie) lost that case because apparently, circuit board layouts aren't protected by US copyright.
What Behringer does might be morally questionable, but it's usually on a solid legal footing. They were just the first to take globalization and outsourcing to a whole new level in the audio world.
But what they did was no novum. Just take some Asian guitar companies for example. Ibanez, Tokai etc. all got a foot in the market by blatantly ripping off designs before they offered their own creations. Hell, basically all of Japan's vast economic growth post WWII is based on copying western products.
Is what Behringer is doing the "gentlemen's way"? Hell no, but this is a tough business and I guarantee you that the guys at Mackie or Peavey only wish they would have been such innovators at this field (not product innovators, but innovators in globalisation and outsourcing). If you really think there's even one company in this business that takes moral before money, then your view is pretty diluted.
No, I don't promote conducting business in such a manner. But I rather have a company like Behringer who expose themselves to copyright and patent issues, than your Chinese rip-off who doesn't even give a shit about anything, including brand names etc.
And these "sweatshop" accusations... well they fit oh soo well in the picture, but it's bullshit. As it's well documented, Behringer city is a modern industry complex, quite second to none to anything you'll find in China.
You really think the Peavey Valvekings and Windsors come from a more "worker-friendly" environment? I really don't think so.
If it wasn't Behringer, it could have been any other company who did the first step in this territory.