the fermzilla fermenters should still be good for you doing kombucha. (like @Malticulous
has ^) the wide mouth lids should let you pull the scoby out when it's done, which is the the issue with carboys. cleaning is easy with the big lid hole.
PET is way lower in leaching oxygen than HDPE plastic like buckets, so it wont push more acetic
there's the bottom dump, if you do any sort of dumping of the muck at the bottom
they have the bottom canister that can be used to add more stuff like fruits, hops, etc. after scoby has formed
You can pressurize the ferment so its carbed and ready right from the fermenter, or closed transfer to keg
the floating diptube should probably be fine for samples, hopefully the scoby will grow over it. worst case, add one or two stainless nuts/washers/etc to the line to pull the float ball an inch below the surface, and you'll be all set. scoby will grow right over it.
they're way cheaper than stainless, easy to clean for kombucha, and do pressure.