I own numerous Color/Temperature changing lighting devices (bulbs, strips, etc), by numerous Brands. These are very similar.
The things I like about these ... the App is free and does not request intrusive access to my phone (e.g. Contacts, Photos). Only asks for access to Location (also asks for Name & Email). Compared to my other Brands, they are starting out much less expensive.
I only get devices that work with Alexa. If I have to grab a phone and open an app to control simple functions, I end up not using it. These work well with Alexa on simple On/Off/Dimming, and Color ("Red"), but I can not get them to change Temperature ("Warmer / Colder") and other higher functions gets a, "doesn't support that" or "outside Temperature range". Clearly they need to increase the vocabulary. The directions do not mention it, but you have to log into your Alexa account and add the Bulbrite Solana Skill. I did not have to do Discovery, the Devices were automatically added. FWIW ... While testing these, the app does not correspond to voice commands. I will ask the light to turn Off. It will turn Off, but App will continue to show it On (unless I closed it and reopen it).
I gave these 5 Star, but I would take a Star away for the voice limitations/app issues, but 95% of what I do is On/Off/Dim, and they are good at that.