I've only ever used a CFC that I built myself. It works quite well for chilling, HOWEVER, there is the occasional concern that some particulate matter from the brewing process might get lodged in the system and cause it to plug up.
Some theorize that an IC is better since the WHOLE VOLUME of wort gets chilled faster, instead of a small portion being chilled quicker with a CFC.
If I had to do it again, I'd seriously consider building a good IC for the fact that they are easier to clean, and cool the whole volume faster (it only has to go below like 140F to be effective for it's main purpose).
But mostly for the cleanliness factor. I've used a keg dip tube cleaning brush on my CFC before and it came out pretty nasty. It's easy to see what crap is on your IC just by looking at it. And they are easier to clean when or if they do get dirty.
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