I had a couple batches a year ago that were pretty hazy. Plus a friend has celiac. So I tried clarity ferm. At the time I liked the results. I couldnt find it local so I bought a butt load from B3. Added it every time like clock work. I had decent clarity ever since. But one time I forgot to add wirlflock, and that beer was cloudy even with CF in the fermenter. Eventually I ran out of CF and brewed a few batches without it. My clarity is just fine, and my mouthfeel has slightly improved as compared to the CF batches. My celiac friend never tried any of the CF beer because she got pregnant and now she has moved away, so it doesn't matter.
In my opinion, unless you are looking for a fix for mild gluten alergies, its a waste of money. Wirlflock improves clarity way way more. If I were to fine my beer post fermentation, I think I would try polyclar or gelatin. I've found that good sanitation, wirlflock, and a vigorous ferment is all I need.