How important is the digital cable between the player and your clock ?


I understand the importance of cables in a system.....but generally speaking, is the cable between a cd / scad player and an external clock an important link ? I will assume the answer is yes.....but how and why ? I would like to hear from enthusiasts who own especially own Esoteric gear with clocks. I am looking to upgrade this cable and was questioning on what sonic impact this cable would have the overall sound. Thank you in advance.       
garebear
In a word yes, it matters tremendously. I need 3 such BNC 75 ohm cables in my DCS Paganini stack and upgrading to Transparent Reference XL made a big difference. Previously I had used AudioQuest Eagle eye. At nearly $3k a cable this is not cheap but most regard this transparent series as top of the heap on digital interconnects

also the power cord to the clock makes a big difference if you haven't already upgraded that
.......thanks folkfreak ...and you are right. I also liked Siltech when I owned the DCS gear. Wonderful equipment .....and sometimes once you get in you can't go back on these cables as you have soo much invested in them. I have the Purist Audio Limited Edition power cord on my clock and that too made a difference.....  
Garebear: Thank you for the additional details and 'Yes',...based upon several iterations of cables over the years, I believe that break-in for pure digital cables does matter and has to be undertaken.  The only exception (IMHO) is fiber optic (AT&T std) and TOSLINK.  SPDIF, AES/EBU and clocking cables all have seemed to benefit quite a bit from it in my system.