I just finished my diy metal halide setup, so the next step is getting rid of the diy co2. I was going to bite the bullet and buy a system. I have looked at ones from M3, eheim, ultralife, etc..... Can anyone give me some feedback on any of the commercial co2 systems that they have used? Also, how do you tell an authentic SAE from one of the "imposters" that are often sold as SAE's?