Behringer made cheap knockoffs of famous products a while ago, and most apparently sucked badly. I've heard more recent accounts of newer products being of decent quality however, and a couple teardowns seem to confirm this. They still mostly clone stuff by others though. The problem to me is also due to the very high price the original stuff is sold at. Technology has progressed to a point an electronic instrument or effect can be built at a fraction of what would be the price 30 years ago, still mainstream producers sell at absurd prices. As an example, I can build with 15 euros in an evening a fantastic sounding germanium transistor fuzz face clone with mosfet input stage and LDR compressor, place it in a box and make a small profit by selling it at €40. If adding a fancy box and famous name will raise its price tag to €150 or more, notwithstanding the differences between costs of non mass parts purchases and production, I'd say the famous producer is asking for its products to be cloned.