My sister absolutely loves, loves these! I couldn't help but acquiesce and put these in my little sister's room. She thinks they're the most amazing thing ever..age 10. 
Very easy to set up and install. They're very sticky and adhere very well on flat paint. Have clips if needed but I had no issues. 
App is super easy to use, set up and navigate. This from an iPhone 8. She can change colors and set times simply thru the app.
Alexa enabled is her favorite. She can just tell Alexa to turn them on or off as she wants.
Only caveat is now she needs more.