I've used behringer mixers for small scale studio and live work and it produces a reliable turnout every time I use it. However, I have had odd and sometimes down right dirty looks from people when I get it out and start plugging things in.
What's the stigma?
I have 10-12 various bits of Behringer kit and I've never had an issue with any of it. They're never going to have the same build quality as a Mackie or a Spirit, but then they're a fraction of the price, so that's hardly a surprise.
Most people agree that reliability/build-quality has always been an issue with Behringer, but certainly the more recent kit that I've had has been fine on all fronts.
I've had plenty of expensive equipment fail (and not through over-use, we're talking straight out of the box), including TWO TL Audio 5021's, a Mackie Pro, a Yamaha 01v and a Neumann mic!!!