Bests & Worsts Reviews from Amazon

I happy set up my new Mighty, connected to Spotify, loaded my playlist and tested it at the house. Everything worked beautifully. Fast forward 12 hours to the gym. I turn the device on, connect to my AfterShokz headphones, and... It won't play. I get a repeated "Spotify login expired, please reconnect" message from the Mighty. I reconnected to Spotify multiple times through the Mighty app with no luck. It *seems* as if the Mighty must have access to wifi to connect to Spotify before it will play. Someone please tell me how this is useful when I'm outside or in any other location without wifi? What's the point? #FAIL