OK, currently I have an NX system, but it's used, and uninstalled. Reason I'm asking this is because I'm looking for something newer and I stumbled upon the CryO2 system. Now I understand this system uses CO2 instead of N2O. Is it any good, because it's fairly new, but just a hair cheaper than NX, and about ball park with Zex. Also, any ideas as to how it works. Like I said, just curious, because if it really is any good, I may sell my current kit to get a CO2 Kit.