Installation is very simple if you know connect 2 son :-) The packaging & the product is the Apple fashion, simple, clear, and well thought out design. I enjoyed the 3 manuals based on case (wireline replacement, replacement or new wireless thermostat). Then everything is connected on appearance. What happiness! accessible from iphone, ipad, macbook, pc. Awesome! The update of a program is extremely simple and visual. What criticism do? no. Taking into account the inertia of the house, and the local temperature of the weather is a good example of convergence! It even gave me desire to buy weather station which provides a link to the external sensor thermostat for a measured outdoor temperature ... The thermostat housing is even superflux.