So far the mics are pretty decent. I'm going to be making a review of mine this week and I'll show it in action. With loud music and a lot of background noise, even the Amazon Echos struggle from time to time, so it's pretty similar. It really depends on the placement of it. Mine is kind of tucked away, so when there's a lot of external noise/music, it does struggle a little, but all I do is say, "Alexa." a little louder and it responds.
It's a lot fun, though! I've been using it mainly for music, but I've also used it to control the lights in the house, add stuff to my grocery list, get weather, directions, make calls, and even play a round of 20 questions.