Weather adjust premium feature

I just want to double check. I’ve looked into it and from what I can tell it’s $29 per controller. Since it doesn’t say per month or per year, I assume it’s per controller per person. It’s not just for the lifetime of the controller because apparently if you replace the controller the purchase can be transferred to the new one. Am I reading this correctly?

Here in Phoenix it gets really hot and so getting the ability for them to adjust to heat waves or cooler weather every 6 hours seems pretty useful. It’s hard to predict the future about this seems it could be $29 per person for a lifetime. In that respect it seems like a great deal to me.

Also, as far as I can tell they didn’t remove anything from our current controllers, correct?