I would like to get another Android TV box but don't want to spend another $199 for another Shield TV (I have one of these in my living room already). My bedroom TV isn't 4K so that's not a factor here. I've previously had a Nexus Player and loved it but I let my ex keep it. My concern on the Mi Box is so/so reviews and slow updates while the Nexus Player just got updated to Oreo. Any other reasons I should be considering a MiBox over a Nexus Player? Mainly going to be using it for Plex and casting music/YouTube from my phone.
Mi Box should be just fine for your uses. It's not the best but it's not the worst. I really like the remote for it.