Product review (3 stars): Otherwise this is a pretty good kit to start with
I bought this product so I wouldn't  need to run out to get all sorts of stuff to install humidifier.  It came with 25ft of 18-2 wire to hook low voltage wiring,  not enough!  You need to run wire for outdoor sensor which in my application used all the wire up.  Then you need to run 5 other wires from the controller to the furnace control board!  Also,  keep in consideration if you don't have sheet metal ductwork,  you will need some sheet metal to mount the unit on and the starter collar for the return is for sheetmetal also.  They sell starter collars at Home Depot for ductboard along with some foil tape to seal the furnace and humidifier in tight so you don't put any damp air into the duct work to through off your RH readings on your controller.  Otherwise this is a pretty good kit to start with,  don't expect it to have everything, as not all applications are the same,  just the basics!