I guess I've been lucky. I've owned a Behringer bass rig that NEVER let me down at the time I owned it...and I bought the head (BX4500) used!
And I've had the BDI21 for a number of years now...still works great...lasted longer than my (broke) Korg Toneworks 411fx, and cost 7% of what I paid for the Korg!
Personally, I think Behringer is filling the void of providing adequate music gear at a very reasonable price for upstart musicians. And I find no fault in that. How quickly do we forget that WE (I know was one of them) were once "upstart" musicians who (didn't know anything about gear) could barely even afford a Boss DS1? I'm very thankful and wished that companies like Behringer and Danelectro were around when I was just starting out on my musical journey.
I do find it interesting that some musicians would critique the quality of Behringer's products. For what one pays for a Behringer, are you expecting the "best bang for your buck"?