channel d ??

i just read the get better sound newsletter and read the channel d site. i have lots of questions but would like some input concerning sound quality improvements using a music fidelity vdac with an ibook g4 and this program . i do have a solid state 30 gig hard drive with all itunes ripped and downloaded at itunes lossless. i have thousands of cds on my portable harddrives. i.m calling them tomorrow but thought i would see if anyone else has tried this. thanks john