Disclaimer - I am a film slut and like all film.
Now with that out of the way.. I shot it at ISO 200, and found the grain to be fine, as in small. The developer I am using is Cinestill DF96 Monobath - which I use with all the films I shoot that can handle it. There are a couple that do not - Silberra Orta where the emulsion literally strips off, and Adox CMS 20.
With DF96, Catlabs is nice and punchy, with deep blacks and bright highlights. I did not use any filters. Will it add something different and unique? No. But only the extreme films I use do, like the super slow ones, or the ones w/o or very weak anti-halation layers (Arista 100 for example) or ortho films. With the rest, it's on me to create something unique

This film is a very decent value though at $6.99/36 exp. That makes it cheaper than HP5, and a lot cheaper than TriX. More expensive than Kentmere 400 which I really like, but Kentmere is definitely chunkier, and also harder to get from my local stores. I mail order it, while my locals always have these 'alternative' brands on the shelves.
For all those getting in a tizzy over Catlabs 320 PRO, it's just a roll of film that costs $6.99 fercryinoutloud. Some here act like they got bound, gagged and beaten. Then again, maybe they're into that sort of thing. Look, I don't judge.
My point? Just try it. If you find it blows, big whup, $6.99 for a life lesson. But I like it.