exhale

I've been doing some testing of the Exhale CO2 grow bags. So far I'm pretty disappointed, because of other bloggers totally false information. Based on what I have seen each grow bag only adds about 100 ppm CO2 after 1-2 weeks inside of a CO2 tent - when the plants are SMALL. Once the plants...

Does anyone use the Exhale bags on their grows and noticed any improvements? There seems to be little info about them. About half say they are great, half say they don't work at all. Just wanted to know if anyone has 1st hand experience. I bought 1 just to try it out soon, and have 2 that are...