Hey there GetThisOrDie,

They are extremely stable using just 2" net pots and neoprene collars.
Keep in mind that my plants finish at 18" or less, but I have grown 4' plants in a NFT system using 3" net pots.

Biggest problem (if it really is a problem) is you can't move the plants after a couple of weeks since the roots start to intertwine.

Biggest plus is that having ultrasonic fog, that is sterile, it will sterilize the entire root zone.