It's a few years ago, but I came across some extremely noisy DI-20s and whatever the other Behringer active DI at the time was.
A guy in my then band had a Behringer DI-20 and it was fine for live work, so another band member bought one. It pushed out something in the region of 40dB of white noise. So it was returned and swapped for another which did the same thing. A third sample was no better.
A couple of years later I picked up a single channel Behringer active DI and, again, lots and lots of hiss. Someone told me around then that he'd found the same thing so took one apart and discovered Behringer had swopped from whatever 4558(?) op-amp was in the originals to another slightly cheaper op-amp that wasn't exactly ideal for audio to put it mildly.