Have been using Philips Hue for around 3 years now. Awesome bulbs! They work flawlessly with my Echo. I also connect my AVR to Echo via Bluetooth hence I can command anything to Alexa and have it on my Marantz AVR.
I also changed my India location to US for sometime to check the HEOS Entertainment app, which is still unfortunately not available in India. I was able to do the basic stuff like power on/off my AVR through Alexa. But other than that it couldn't do much as all the online music streaming providers are not available in India like Deezer, Spotify etc. But it works!