I have hesitated to post about my experience with Greenlight as its isolated and I have no idea if my experience can be accurately generalized but basically, I don't trust a thing from them.
I bought a G9 Omron enail controller from them via Alibaba. It was definitely bought from Greenlight. I bought it because a friend on this board has one and it worked wonderfully for him and was properly equipped with an external solid state relay inside the box, proper wiring through out, and proper default settings on the Omron. This guy knows enails and was happy with it so I bought one.
Mine however, was a complete and utter POS and I can't believe that any engineer anywhere would be glad to put a unit out like this.
First, it didn't have PID turned on (duh) but when it was, and programmed with good Omron settings, the temp was still very unstable with large over/undershoots.
So, now time to peak inside the box. Oh, the horror....the horror. First, this box included the correct Omron PID unit that is capable/intended really to drive an external relay to switch power to the coil. This is absolutely necessary for good performance. This unit had the right Omron assembly but had absolutely no SSR at all.
Then the next apparent thing was that the Omrons have screw down wiring connectors....but Greenlight soldered the wires to the top of the screws. I had never seen anything like it. Wow.
Then, of course, it was wired correctly at all (aside from being soldered, I mean that the wiring was not terminated to the right connectors...oh, it worked sort of but badly).
Communications with them was torturous and they never seemed to grasp that their design and build of this box was completely faulty.
Finally, my dear and valued friend,
@mutten840, agreed to help me and basically rebuilt the unit. Kept the Omron and the external case, added an SSR, rewired the whole bloody thing, program it correctly, put a better XLR connector on it, and now its a decent box.
So....perhaps not applicable to all Greenlight products but this was my experience and I will never buy anything from them again.