I get a slight metallic taste from Coke Zero. However I find that Diet Coke leaves me with cotton mouth, so I switched to Zero.

I used to drink Coke regularly but I was advised to stop for health reasons. I'm not morbidly obese or anything however I have a couple of medical problems that can be solved by losing a few kilos :) I don't tend to ingest a lot of sugar from other areas so switching to a non-sugar soft-drink was a no brainer.