I'll add that there is also price bias on this forum. the CDT 6000 doesn't cost enough to get a good review from some people here.
My observation has been different. The Audiolab 6000CDT is mentioned often on this forum and in a positive light. For 600 dollars many consider it a very good value proposition.
What I have read is that those familiar with the 6000CDT have simply stated it can be noticeably bettered if one has a higher budget ceiling. Usually, they are referring to the Jay's Audio CDT2 MK III (Certainly the CDT3 MK III) or the Pro-Ject RS2T, CEC etc. This is hardly a putdown. These are much more costly and do perform at a higher sonic level. No shame in that at all.
For 600.00 USD you'd be hard-pressed to beat the 6000CDT. If someone is willing to spend 3-5x the cost, then the other transports will demonstrate their relative worth. Seems fair and logical to me.
Charles