"Are they along the same lines as the Aprilaire...just run a Cat5 wire to it and I'll be good to go?"
Yep on the HAI, it really is that simple. I have two of them installed... My only gripe and not sure if politics123 has the same, but i've got a problem with being able to keep the front cover tightly closed. I know it's cause the cat5 wire comign through the back/wall is pretty thck. And it just seems to push enough that one corner is generally slightly lose. I may try again tonight to see if i can resolve. But i think i have to admit the overall look/feel/build quality of the Aprilair seems a bit higher.
The seperate design of the RCS units ruled that out given the ease of the other two
The Aprilaire is nice, but ~2x the price of HAI, i think its price versus your perception of value which is different for everyone. My father in law is an AC contractor and he thought i was nuts buying the HAI given what he could have given me a standard white/rogers programmable for.
Just curious, can you get the remote temp/humidty readings passed back to the elk somehow?