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DIY Co2 is worth it to me. It's not complicated and plants love it. Just remember, the more lighting you have, the more Co2 you need or everything will suffer.
Pros:all of the above.
Only con after initial cost of a pressurized system and finding a balance, is the higher maintaince. As a hobbyist though, I personally don't mind the grind.
+1
I have ran into my share of folks that go "high tech" then eventually "can't find the time."
Having said that "my plants grow crazy fast" should merit some caution. I suppose.