I had bought the Model: SYL-2342H, and it worked just OK. It always seemed to lock up on me. I ended up buying a timer that reset the power every hour and that seemed to help some. There was some talk going on about adjustments and extra parts that Aurber suggested but from what Mr Walleye had tested did not work any better. Anyways I just received the plug and play one and really have not had a chance to test it out other than for about 2 hours today just to see if everything works. Very easy to set up but the big difference is it will not run a humidifier and a dehumidier (fan) at the same time. Either one or the other. The heating/fridge side I don't need but I am sure it works OK. Just remember the total amps can not exceed 15 amps.
Hopefully in the next little while I will be able to get a batch of something going to really test the plug and play out better.