Thanks for the link to that article Left C. It was entertaining. I have not considered purchasing one of those, nor ever seen one, but its claims were unbelievable. Although its unfortunate that someone would attempt to take advantage of people in that way; it is fortunate that the aquarium hobby has so many knowledgeable people who are more than willing to "debunk the junk" that is commonly presented to us.
kidnick, I purchased an inline reactor from aquariumplants.com and it works very well. Its one they make, although when i received it I'm sure someone could figure out how to make their own. Tom Barr had a posting of a DIY submersible reactor very similar to the inline one i have. I haven't used it with a planted tank yet, but tested Co2 changes (how quickly did pH change in the water) when running it while testing my plumbing on the tank for leaks and also getting a feel for how my pressurized system worked. There was no bio system here just a big bucket of water, so i attributed pH changes specifically to dissolved CO2. I saw changes in pH over time directly related to the bubble count, so I believe the system has a very good dissolve rate. It claims 100% and I don't have a reason to disagree with that.
You may want to consider increasing the flow in your tank using a water pump. I plan on using one in my 37 gal. My filter runs at 164 gph, i doubt it actually reaches that considering some of the inline things i'm running. From what i have learned its adequate for filtration, but not flow. Flow is important in providing nutrients to the plants throughout your tank and I've read that in places which are heavily planted the flow rate can be reduced by up to 90%.
Take in mind however I have yet to complete my first planted tank, but have been doing a good deal of reading, researching, and learning in preparation. A great deal more than I anticipated because i have been waiting for my lighting for a month and a half now.