I have made it once only and it did not turn out very nice.
Some of the chowders look very nice - you have to use heads and tails to make the soup "rich" and nourishing, and it is something I have eaten once only in America where it was very yummy.
I did have once some where in a restaurant in the city long time ago (now that restaurant not there any more) was very nice. And another one when I was on a business trip to America Minnesota that was better than the one I had in Sydney.
When I was growing up there was a fabulous restaurant which made the most incredible Lobster Bisque in all the world!!! Oh! It was glorious!!! We would have it every time we went there. My mother actually made it several times and it always turned out utterly delicious!
I have never tried to make it myself.
My mother used to make fish soup from large, VERY large schnapper head. Cook in water to cover for 20 minutes (no more). Strain, add a little rice, an onion, black pepper. Return to simmer and cook further few minutes til rice softens. Remove beautiful white meat from "cheeks" of snapper and put into soup. Remove the onion and discard. Serve. No fat, good for you. If you love seafood, you will love this.
The only other seafood soup I have had was Laksa, and I loved it.