My old can lamps were just holes in the ceiling with the bulbs exposed so I started looking for improvements. There are so many lighting/color/shadow options to choose from that I loved the fact that they are customizable. I was also intrigued by the music function so I took a chance and got this 4 piece set. As other reviews have said, installation is as easy as screwing in a lightbulb. You may have to rotate them a bit to get the light level and you may need a paper towel to wipe the fixture and ceiling if the springs in your old fixtures are old and rough like mine. Syncing with the app was a breeze, although I had trouble getting all four lights to respond to music playing (the app opens a small microphone screen for the lights to sync to sounds when recorded on your phone) . I asked customer service how to group the lights, thinking I'd never get an answer from a real person. To my surprise, a support rep replied and even sent a screen capture showing how to group lights more effectively. (It wasn't the most intuitive solution, but it worked!) Alexa now toggles on, off, and even "film light," which is a nice light blue glow that we played around with. Very happy with this lamp!