So far, no tangable proof has been offered (side by side grows, or even non-comparison personal grows) to suggest they are even a pheasable option in the first place. Little alone better than airstones...
-P.S. I contend that the poster claiming success with this product is just another account by a member named Jhenry...whom I've argued vigorously with because he was creating and posting dozens of threads all, eventually, endorsing the O2 grow emitter. I simply ask for the person using one to just take a picture of it in their grow...pretty easy request.