If seen the system as well, didn't take me long thats its like $25 more than a DIY CO2 system and does the EXACT same thing.
A DIY CO2 is not hard, I got mine to work first try, no leaks, I just siliconed the heck out of that cap. And it works too, I went from 2.3 or 1.4 PPM of CO2 to about 7.6 in a matter of two days.