I agree with all of the above. I'm using 0.3 gal, 0.8 gal, and 1.5 gal Air-Pots. Very noticeable increase in growth in these compared to every other pot I've used. I've never used smart pots, though, and everyone has great things to say about those as well. I'm sold that it's not a gimmick. Proof is in the puddin'. :smokebuds: