Easy installation. Suggest watching a youtube video before installing as the installation guide is good, yet vague.  The instruction manual is excellent.  NOTE: refer to the detailed measurements on the model in which you are interested BEFORE you order, as the seats will NOT fit all toilets.  Be aware that the seat lid is NOT for sitting.  Works very well as advertised.  If you have a counter top above your toilet tank, you may need two silicone bumpers (versus the one included) since the toilet seat lid, when raised, may extend past your counter top.