The only problem that I found is the time it starts to load an external 250GB hard drive, but once supported then it's happiness!
I chose the 400 for the USB mode (the first from Pioneer) and I thought it was a good compromise. (They are made to train with me)
If not other effects, loop and beatloop works very well and the effect is nice roll!
Pioneer in the price is a bit unfair I think it's expensive for what it is, but hey it will not work in not sure what kool! (Lol)
And since the release of cdj 2000, pioneer decks have taken another leap forward!