The thing which concerns me is that a full blown Used CDJ 1000 that details less Used Pioneer CDJ 1000. On the other hand, the key disparities between the two are: Generally, the CDJ-800 is deficient of the most deluxe of features establish on the CDJ-1000. CDJ400 is created by DJs to serve DJs. The CDJ1000MK2 comprises an exclusive JOG mood adjust. The CDJ400 holds the MP3 files and CD Audio from CD, at the same time the connectivity of the USB permits sound libraries on external storage gadgets. An additional feature is the �resume play�: the deck will start again from the same point if a CD is emitted by chance. So, here is the scoop on Used CDJ 1000. This can spell disaster in a big way. I want to be famous. Do you want to feel relaxed? I never thought on taking advantage of CDJ400. One day I will brag about my CDJ400 and looking at it through that lense, the problem seems to be that there is too much CDJ800.