I have 8 Hue bulbs. White only. I don't have any use for bulbs that change colors.
I love them. I only have them in the lamps in the house, but I love lamp light instead of overhead light at night. I find them to be very cool and convenient.
For one, I'm lazy. I have 7 lamps in the living room, kitchen, and master bedroom. One voice command turns them all on to whatever % magnitude I choose. I also have them grouped into rooms and names so I can just turn on one room or turn off one individually.
You also needed to get the IFTTT app to add recipes. For instance, "Alexa, trigger good night" turns all the lamps in the house off when I go to bed. I have an Echo Dot on the nightstand so I can do this after I'm in bed rather than go around the house and in the basement turning off lamps. "Alexa, trigger quiet time" turns all the main floor lamps to 20% dim. Good for after the kids go to bed and saves energy.
My wife was skeptical, but she loves them now. Are they necessary? No, but if you have the money and want to get into the smart home thing, why not?
I also highly recommend the Nest smart thermostat.