I use VLC on my Android smartphone whenever I'm on the train or bus and the only reason why I wouldn't give it the highest possible recommendation is that they

I use VLC on my Android smartphone whenever I'm on the train or bus and the only reason why I wouldn't give it the highest possible recommendation is that they have implemented stop by having you hold down pause for a bit, rather than having a stop button in the UI. Aside from that I can't think of anything wrong with it, it plays .opus (and a slew of other formats), it has an equalizer with a bunch of presets, it doesn't drain too much battery, it doesn't crash, it doesn't show a bunch of ads,... in short, it's a great media player.