Yes it is true, the CDT2 is a great sounding CDT. But the CDT3 is in fact one of the best sounding sources available at any price. Never thought I'd say that about a Redbook format device, but it is what it is. Speaking as a fellow audiophile we have tried to beat it with many expensive streamers and such but have been unable to. Even with external Master CLK'ing, eg Esoteric, which BTW did improve the device(s) it was connected to but didn't improve the CDT3 IME.
If you're looking for the best sounding CDT, the CDT3 is it IME.
TK of TEKAudioSpecialties