Am getting on pretty well with Alexa here. Hands free kitchen timers are just too useful, and calendar integration keeps the household sane and at tempo.
Skills wise, we don't use much. Mostly its just voice commands to play some music (No! not that version! What's with you? Jeebs girl!) or to turn on/off/interact with any number of little ESP8266 projects I have dotted around the place.
What I really want her to do is realise when I'm being quiet, and whisper confirmations back to me. Every night I hear "OK" blasting from downstairs as the other half turns off the lights, closes the blinds, etc.