I don't know about the rest of their products, but their over-ear headphones (Q45 being one specific example) have very weak attachment of the cup to the frame that often cracks and then breaks withing several months of use. This has been well known for at least a decade, and they have done nothing to fix it.

Sounds like they have alright customer service, if you live in a region where it is actually available (not me), and don't care about polluting the environment with yet more short-lived plastic trash. Not really something to support with one's hard-earned money IMHO.