A little while back behringer made a pioneer djm 600 mixer clone.. it sucked really badly on many levels, it was wrong and poorly built. they obviously got their fingers burnt, as their new flagship ddm 4000 digital dj mixer is quite the opposite 
(NOTE: new test results added afew postings down this thread)
http://www.behringer.com/EN/Products/DDM4000.aspx
(their new, rubbish website)
Dispite being lighter than you might expect, it is built as well as any mixer youd pay top dollar for; it packs more features & sound fidelity than its ‘rivals’ and rolls in at an obscenely cheap £250 / $300 
and honestly, after using it.. i personally couldnt justify buying the priceier alternatives
hmm, its based on 2x 400mhz analog devices blackfin dsps & cirrus logic 114db adc/dacs.. under specced it is not
certain widgets like bpm syncronised effects are increadibly fun & useful, also features eq and dynamics processing on all channels. the mic section also has its own effects section for adding reverb etc ..and supports channel ducking for announcements/radio talkover.
digital out also, however no digi ins 
..would be nice to see, as would remove one more adc/dac stage when using the cdj-1000’s
the mixer was probably designed with being paired up with the cdj’s in mind, as dispite the odd orange and blue dominated lighting scheme it actually fits in very nicely with the decks
also, took the time to test the players and mixer with midi control from the mixer to use it as a control surface for traktor ! ..and used the time code cd’s in the cdj 1000’s to control the scratching section of traktor to manipulate music on the pc also. i can confirm all of this works flawlessly ..supprised at that ! ..was expecting a niggle.
unfortunately, this does mean ill never build a mios traktor controller ..ah well, more time for other projects
right.. down to business:
..and lights off, ooh ! pretty
nice speckled silver/black finish
also modded the usual problem of overly bright blue leds, 4.7k added worked a treat.. tho maybe the next value up for some peoples tastes, only this doesnt burn the retinas out now
EL backlit screen.
sliders are standard resistive tracks, not optical as reported some places !
nice, slightly resistive feel.. marked with a B in a triangle
new power opamps for headphones, supprisingly good.
manages to run even relatively insensitive headphones like my other set, the akg k702 reference cans quite loudly.
the sony mdr’s are dangerous !
dsp card with two 400mhz blackfin dsps !
a supprising ammount of shielding & rfi filtering for a ‘budget’ product
very simple smps ..not many linear psus in berry stuff these days.
the plastic screen guard needed wiping from the inside to clear some residue from manifacturing ..not bad, but a noticeable streek on the plastic.
main board:
* 2x xtal - 16mhz
* 2x headphone amps - cool audio V4580L high current opamps.
* 2X AMTEL - ATMEGA8 RISC PIC
8-Kbyte self-programming Flash Program Memory, 1-Kbyte SRAM, 512 Byte EEPROM, 6 or 8 Channel 10-bit A/D-converter. Up to 16 MIPS throughput at 16 Mhz. 2.7 - 5.5 Volt operation.
(lots of:)
* 74HCT165 - 8 bit parrallel in serial out shift registers
* 74HCT595 - 8-bit serial-in, serial or parallel-out shift register
* 74HC4051 - 8-Channel Analog Multiplexer
* 74HCT244 - Octal buffer, line driver; 3-state (afew)
main board, analog i/o section:
* jrc - 4580 - dual bipolar opamp, 0.0005% dist, 15mhz, 5v/us slew, 0.8uv/vn (standard behringer faire)
* st - 074c - quad jfet opamps, 0.01% dist, 3mhz, 16v/us slew, 15nv/vn (old opamps, very odd !)
dsp card:
* 2x analog devices - black fin, adsp-bf532 - 400mhz !! (800 MMACS) 32 bit dsps.
http://www.analog.com/en/embedded-processing-dsp/blackfin/adsp-bf532/processors/product.html
* samsung k4s281632i-uc75 - 128mb sdram, 3.3v 133mhz/cl3
* hynix - hy57v161610ftp-7 - sdram, 3.3v, 16m, 64ms, 133mhz
* xtal - 25mhz
* xtal - 11.289
* 74LVT244 - Low Voltage Octal Buffer/Line Driver
* 1x cirrus logic - cs4351 - 24-Bit, 192kHz, 2ch dac, 112 dB, -100db thd, with Line Driver
* 2x cirrus logic - cs4345 - 24-Bit, 192kHz, 2ch dac, 105 dB, -90db thd (marked 345c071)
* 4x cirrus logic - cs4272 - 24 bit, 192khz, 2ch adc & dac codec, 114db snr, -100db thd/n.
* 1x cirrus logic - cs4271 - 24 bit, 192khz, 2ch adc & dac codec, 108(adc)/114db snr, -98/100db thd/n.
