I've been using this for the last 6 months and it works great. Channel 4 works perfect. Channels 2&3 have a slightly reduced channel output round about 3dB lower than Channel 4. Channel one is much lower, you can nearly hear it, but it works. This does not affect using the mixer it works fine. This is a common thing with Pioneer DJM mixers and is an easy fix with a service. The two buttons on the effects(see pics) don't work, but the knob controlling the same rhing works so it's not a real issue, unless you want them working. There is a minor humming when mixer is switched on, this is common with DJM-600s and does not affect using at all. The mixer could do with a service, but works fine without one. Comes in a Generic box.
eBay