One issue with carb stones at least in my experience is that if your not careful you can scrub hop aroma right out of your beer. If you go through the trouble of dy hopping an IPA only to scrub out most of the aroma it can be frustrating. That said I naturally carbonate and then use a carb stone inline during filtration if i need extra carb. Also Filtering a beer thats been dryhopped kills lots of aroma to, but usually i am forced to filter my IPA's due to hop pellet flakes that wont settle.
"You are what you is." FZ