Not completely true
Much of the early days of Behringer were direct copies of patented circuit designs by Mackie, dbx, Brooks Siren, drawmer, Alesis and others. At the time (and possibly still now) the Germans did not recognize US FTC or patent laws so the class action lawsuit went nowhere.
This is just one of many items regarding this lawsuit from wikipedia:
Trademark claims
In June 1997, Mackie accused Behringer of trademark and trade dress infringement, and brought suit seeking $327M in damages.[32][33] In their suit, Mackie said that Behringer had a history of copying products by other manufacturers and selling them as their own.[34] The Mackie suit detailed an instance in which Behringer was sued by Aphex Systems for copying the Aural Exciter Type Fin that case Aphex Systems won 690,000 Deutsche Marks.[34] The Mackie suit also mentioned similar cases filed by BBE, dbx and Drawmer.[34] Behringer has won at least one court case against Mackie for infringementon November 30, 1999, the U.S. District Court in Seattle, Washington, dismissed Mackie claims that Behringer had infringed on Mackie copyrights with its MX 8000 mixer, noting that circuit board layout was not covered by U.S. copyright laws.[35][36]
In other words, Behringer copied US and British designs, had zero R&D costs, and built the equipment in China.
Also, the ISO 9001 rating may be just on assembly and not the quality of the copied compenents. I realize they are paying the workers nothing, but believe they cut corners with parts as well.
Search Behringer lawsuit and decide if you want to support this company.