This is one of the best products I've purchased as a parent. I've been using it for my toddler for 11 months and it has eliminated the struggle to transition to bedtime. My toddler stays in his bed all night until the programmed time when the light changes colour. If your child knows their basic colours, they're ready for this "clock" as my son calls it.
We love that we can control it from our phones and quickly make modifications to the routine when needed. The ONLY reason I wish we bought the portable version instead is when we have power outages or flickers, the sound machine and light turn off which wakes up and upsets my child. Other than that, it's perfect.