I have the X10v3 (with power supply which really improves the already v. good performance of the basic unit) but have not tried the Decware ZB. The X10v3 really is capable of transforming mid to lower priced CD players into giant killers. Apart from that, it does add a tube flavour to the sound (basically, adds some bloom into the sound; very pleasant but some purists may say its not accurate). I do not know the CJ pre-amp so cannot comment as to whether this will add up to too much tube.
Hope this helps.
Hope this helps.