I see both sides of this debate. There's a lot to be said for the safety features built into a Zex, but I don't see it as an argument against the NX. Follow the instructions and set it up as they say, school yourself on the do's and don'ts of nitrous (which you should do ANYWAY, lol) and NX can deliver lots of nitrous fun. We've used their equipment exclusively for years, and their four nozzle system (port injection) fits nicely under the intake manifold of a 420A DSM.