I got mine installed and working. The hardest part was getting the RO/DI water to 4 dKH. I think I spent about 1 hour doing this (add baking soda, more baking soda, more water, etc...). It was a little difficult getting the water/indicator in until I realized that the old pipettes from Seachem Flourish bend right around that tight curve and squirt it right in the bulb.
It is a very cool device that gives you a good indication of the CO2 levels at a glance.
Thanks for being the guinea pig and trying this out for us

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Brian