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I've been looking at them as well.
At the moment I'm undecided.
The advantages are faster fermentation for certain styles and being able to transfer beer without oxygen getting in.
Disadvantages are price of the extras you need, the size of it and the PET vessel only has a two year lifespan before it starts degrading.
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After a night of watching YouTube brewing videos it seems that there are two advantages.
It makes lager fermenting faster as you can use higher temperatures for the yeast.
If you brew highly hopped beer such as NEIPA's you get a better dry hop transfer into the beer.
Everyone uses CO2 and corny kegs though. While I'd like to go there eventually it does mean building a kegerator or a keezer to dispense them.
Has anyone used a fermzilla? Everything I've seen online looks good but does anyone have any first hand experience of them?