so thin and smooth - spring locks stay in place. I think the existing wiring makes the biggest difference in the installation. If there isn't much room and the wiring is already stapled to the studs, just because you don't have a lot of room to work with, it becomes harder to secure the connections. but it's simple, straight forward and looks amazing when finished. I also used a Lutron Sunnata Touch dimmer. adds a nice touch to modern design. In fact, a box j of 4 packs didn't work for him. Contacted support and they replaced it a week later. Good service!