Apart from the cheap plastic case their circuits actually sounded exactly the same that the stuff they cloned, but it took awhile for forum users to publicly acknowledge it.
But if you're limited to drilling some holes in an off-the-shelf enclosure, it had better be metallic. I learned that lesson the hard way, and I now use metal boxes exclusively. Luckily for me, my product somehow hasn't attracted the interest of Behringer or other low-cost makers -- yet.
Also, judging from some returns I've gotten, gadgets can be subjected to a lot of abuse. A musician can control this, but a gear maker can't.
I've seen the insides of some early Behringer gear. A lot of their early stuff was mechanically delicate, and showed signs of extensive "re-work" in production.