Hi and thank You for question!
Yes, i look at ESP because it have wifi onboard.
But its power consumption is not so applicable for autonomous devices.
I get less than 0.5 miliampere for active working p328d chip (Arduino Uno give 30mA) and prefer use BT or paired RF-433MHz/NRF24L01 module to connect foreign sensor with base.
This solution provides significantly lower power consumption.

And i forgot - several months ago i read that some freshly released ESP have trouble with saving program in it.