TNB CO2 mini tanks?

Well guys .. I have to agree with the fact this is no means an efficient way to supply co2 .. But depending on circumstances... See atmospheric readings or ambient readings of co2 are only 300-400ppm... And if you are talking about a little 3x3 or 4x4 grow with four decent plants they will depleat these levels quickly.. And co2 is absolutely critical in the photosynthesis of the cannabis plant.. You can throw all the light at it as you want but the fact is if you don't have sufficient amount of co2 like the 700-1500 ppm your plants won't reach their full potential.. So saying this if you just have a little cheap grow tent going with not a big budget and you want to experiment or at least raise your levels of lacking co2 there is nothing wrong with adding the co2 canisters.. In fact I personally have tons of experience and as for research goes and what you find on the net nothing compares to personal experience.. And I have used this product it did raise the levels of co2 in my small grow tent substantially for about a week not two as it claims but does continue to produce co2 for 2 weeks and does stay above ambient readings.. And I found my plants absolutely love it.. But what I do is just spend $20 on the refills get two of them and put them on each side of my tent using my own bottles for a total of $40.. And it lasts me two weeks and the girls love them.. Specially since my par readings are over 1000 umuls/s .. Which it has been proven anything from 800 -1000 umuls/s if you don't raise the ambient ppm reading of co2 you are not gaining anything but wasting hydro.. So yes this isn't the best way to adapt co2 to your grow especially on larger scale grows anything over a 4x4 grow be a waste of money.. But when you have a tight budget and the fact of having a small grow and the lack of co2 I say go for it.. It will help .. Just don't expect the same kind of results as a co2 residual feeding system.. But with that feeding system comes bigger bucks... If your small and cheap give the tnb canisters a try..Its better then nothing that's for sure.. Specially if you invested in good high power lights and you want to take advantage of them.. And I would also Luke to ad if you run co2 you also can run much warmer then you would if you didn't have co2..So in conclusion yes these guys are right in the sense that no for $40-50 you can't simulate what you get from a fed system.. But for $20 if you but the refills and throw a couple in your 4x4 for a cost of $40 every two weeks .. Keep in mind I use once for two weeks in the middle of my veg cycle then again at the beginning of my flowering weeks and once more near the end ..so I spend $140 altogether full grow... And it has helped a lot specially the fact I invested in high power lights and have small grow.. But now that I have seen the results.. When I'm finished this grow I will be upgrading to a two tent system with a 4x4 for veg and a 5x5 for flowering.. But to be cost effective and to sustain a reliable source of co2 I will be investing a fed co2 system.. Obviously the better way to go.. But in short if you got the money don't waste your time.. But if you don't have the money or just want to try it out I say go for it .. Adding some form of co2 is still better then nothing that's for sure!