Id agree, amazing headunits, but not hugely reliable. We used to stock the CD400, and i loved it. i enjoyed watching lads on mopeds comming in and taking the piss out of it, because it does look like a standard head unit, which is another reason why i liked it. units used 24bit digital to analouge converters which is why they are so highly regarded. i never had a customer come back with trouble, however we didnt sell many, and from what ive heard they can be a bit of a mare, i remember the first few batches of them we had, didnt even come with an ISO connection, just bare wires.