I've worked a couple of times?with the DDM 4000 and I own a djm 700 myself so I can give you some kind of an honest opinion. To start with: The behringer isn't bad at all, and overall build quality is better then the djx series. The quality of course is far?below pioneer, because it is not meant to be placed in clubs,??but for home usage it might just be enough because?it also is completely digital. Because of this the fader problems of the djx series should be less noticable if they are even?present (no cracks and things like that).?I also have some negative feedback for the ddm: the userfriendlyness is faaar below pioneer. That is why i didn't like it. On a pioneer you need 2, maybe 3 actions to trigger an effect with a certain setting. On the behringer it is a lot more, taking you trough?menu's on the screen and that kind of stuff.?The effects also sound better on the pioneer mixers. It is great that almost every parameter is adjustable on the DDM, BUT because of this it lacks userfriendly-ness
If I had to make this choice I would get a Reloop RMX40 Blackfire instead. It is in the same price range, the effects are very easy to work with like a pioneer mixer (except for sound quality, it is below pioneer), decent build-quality for it's price and it has 4 channels! Sorry pioneer, the DJM 400 is just overpriced lately