to volume pot or not to volume pot

I am getting the EAR 834-P MM/MC. I do not know whether to get the volume pot or not. I will be using it almost exclusively with a separate pre amp. Is there any difference in the sound between the two? One review I read stated "the black 834P without the volume pot is the wisest-choice cost and sound wise". Is this the common opinion? cost is not an issue.
Thanks in advance.