I've put 'em through the wringer occasionally...like today. The person on 'chat' didn't really know if their smart-outlet could be triggered by VPD, which is what I really wanted to know. The new Controller has that feature, but I wanted to make sure it would work with the outlet and not just with the humidifiers/dehumidifiers they're about to introduce. I got a reply about 'you can set the VPD offset in the Controller 69' to which I said...yes, yes you can...I knew that, but that's not what I'm asking. I'm asking if this controller can use the high or low VPD triggers from the controller. She replied that if I didn't like it, I had 30 days to return...and I pointed out that its a 20$ unit with $12 shipping in each direction so I'd lose out if I had to return it and pay for shipping each way. She politely excused herself and said she'd have to ask her manager for information if I didn't mind. I didn't mind and she came back about 10 minutes later to say that I could trigger by VPD, and they'd cover the cost to send back if that didn't work as mentioned.
...I ended up ordering it on Amazon (free shipping, and still from ACI)...just to hedge my bet even though it may be a slower transaction.
The idea that I can set for a specific VPD zone and have it humidify automatically if it slides out is really great since VPD changes with temperature, though I can also set advanced programming so it acts differently with lights on vs. lights out if I need too.