In small grow spaces, people try various things to boost CO2. The DIY yeast method is popular. Exhale bags are a little like that - they produce CO2 through a process, and it isn't a lot nor can it be regulated. If you want to spend the money, it can add a little boost. How much of a boost? That is really hard to say.
When you get into sealed environments and regulate CO2 by measuring PPM, it can be a large boost. However, then you really should have a grasp of all the limiting factors and how they balance with each other. I would even recommend some successful grows before you go that route.
Since you're growing with CFLs in a portion of a room (I checked your journal), I don't think you're in the market for $700 units and whatnot. I could be wrong, but since you are looking at Exhale bags, probably not. I would recommend that you get a handle on lights, watering, nutrients, pH, and so on if you haven't already before you worry too much about CO2. I use CFLs too, but with those, better lights would have much more of a boost than a little extra CO2.