So I've heard plenty about Behringer and the facts that 89% of people hate their products. A friend of mine own the motorzied-fader BCF2000, says it does the trick (and he even modded it to slide better). I can say I would NEVER put their products in my audio signal chain, but it leaves me to wonder; with all of their MIDI controllers, mixers, and other products, what of Behringer's products are actually worth the small price?

A list of what's good would be shorter. They make an audio interface that's well-regarded, and there's the Truth monitors. I've got a Behringer parametric equalizer that still works just fine after about 4 years on the job. I'd stay away from anything that's got lots of knobs...they're famous for falling off or breaking internally, being soldered directly to the circuit board such that the solder joints bear all the pressure when you work the knobs.

Their hum destroyer HD400 works for me. I wasn't sure at first if it's going to work, but for 30/= it stops the soft computer mouse (and screen update) noise when I put it in between my Quad Capture and the Truth B3031A monitors.
 
I've also got the B-2 Pro condenser microphone that works well recording acoustic guitar and wind instruments.

Deq2496 is excellent as is the ada8000 for their respective prices of course.
The X32 mixer was a CES winner this year.

Supposedly Behringer's Quality control has gotten better in the last couple years.  I have some of their items that I like, (V-Verb Pro, ADA 8 Channel Preamp, a Headphone amplifier).  I have also used stuff I didn't care for.   If you are interested in a particular item, do some research.  Usually the rule applies, "You get what you pay for" - but there are some good deals to be found.

FCB1010 - if you are looking for a fully flexible MIDI floorboard. works nicely but you need to upgrade the EPROM first. then you get a controller that you can program to do whatever you like ... MIDI control of guitar FX rack units, hands-free remote control of Sonar from a recording room ... heck, you can even program flashing LEDs for Christmas decoration ...
 
 
 

The X32 got great reviews and that's £2K...the small-format mixers are OK for the price.
the ADA8000 has been replaced by the 8200 which is fairly decent, apparently.
The Bugera guitar amps are also excellent.
The V-Amp range is liked by some people too.
 

I believe many have had product failure with the lower cost items.  However they have introduced items into the market that allow people with shallower wallets to still get some of the audio products they need for music.  But, when it breaks, in the end it can be more costly.  Therefore I think you have two clearly divided opinions....owners with usable units and those that have the broken ones.  Unfortunately, there are many in the latter, to tarnish the overall.
After acquiring a couple of 'heavy hitter' companies, Behringer Music group appears to have stepped up their quality, along with building their own manufacturing facility in China.  The X series mixers and the related products are appearing to hold up VERY well in the field and in some cases have redefined price points for some products like digital mixers and monitoring systems.  As a musician, I'd like to see this trend continue, but wish it could help the USA economy more, rather than the Chinese.  But that's another topic to avoid.

Behringer isn't the only low-cost vendor, just probably the one with the broadest product range. ART, Zoom and Samson are some of the other "value" manufacturers. ART in particular is a cut above but in a comparable price range as Behringer. ART has some great preamps and headphone amps. Samson makes some cool and unique accessories, including a headphone monitor that I've used for many years. Zoom offers some amazing values for portable recorders, compact mixer/interfaces, drum machines and stompboxes.

I've got several Behringer products.  All of them work well.  My BCF2000 has been a "workhorse" that I got back in the Sonar 7 days.  I have a 4 channel headphone amp that does well. I also have a much used Behringer CT100 cable tester that has held up well.  I have  a couple Behringer DI boxes (one active and one passive). 

I have a Behringer "knock off" of the Boss RV3 that works and sounds better than the Boss unit, however the Behringer is in a "plastic" type case.