In short: HIGLY RECOMMEND!
I use a big berkey water filter w/ black elements on top and the fluoride removing ones on the bottom. I have chloramine/fluoride treated tap and I don't like to drink it. My aquarium loves it, I love it. I still use a few drops of prime (water conditioner) just in case. It filters very slowly though so keep that in mind. I have a 60p/17 gallon tank and with the big berkey have to fill it up a couple times and wait for it to filter around 2-3 gallons for my water changes a week. I wouldn't be patient enough if I had to do bigger changes than this.
Also be sure to follow the "priming" instructions for new filters. I had to flush out the fluoride filters for a long time before the water was clear.