co2boost bucket

so i recently got one of those little co2boost buckets and im wondering if it was a waste of money or if it actually produces results, my setup is 5x5 with a 600 hps and a 430 sonagro with 12 ladies, the bucket is basicly full of some organic crap with a little air pump on top

Waste of money.
I'm sure it produces co2 but co2 doesn't do the average person any good. All you needed was fresh air coming in. If you vent all the time then it has no chance to do any good.

Well Its made to run when your not venting, and it does work. My buddy had one and I checked his grow room with a remote probe air monitor that I use for work (confined spaces) he was at 850 ppm c02 with the bucket on and his was set to vent every 3 hours while lights are off to lower the humidity in his basement grow room. So they do, do what they say??? So in a normal tank C02 setup you dont think it vents out with the exhaust?? Unless you grow in a sealed room (most dont) its impossible not to lose C02