First thing I wanna say is that there has been a "fork" of this MPlayer OSX Extended. So my testing and review it's based on that fork and not on the original one.

You can get the latest version of MPlayer.app (the "fork") here: https://sites.google.com/site/hermihg/

I wouldn't say it's the best one, since MPlayerX it's really good as well, but I do find MPlayer more atractive because of:

1. Player design. It's really eye-candy, I like it more than MPlayer X and most of the functions I use (chapters ordering, audi or subs switching) can easily be reached through a prompt window inside the video (which I wasn't able to do that on MPlayer)

Besides, fullscreen controls has been completely redesigned making it more gorgeous than the official rev14

2. Hi10P. I watch a lot of anime, and Hi10p has been the new profile almost every "serious" fansub has been rolling out. It also supports Ordered Chapters.

3. CPU Usage. I'm not sure if it's because of the MPlayer 2 binaries, but MPlayer.app performed better than MPlayerX on a 720p and 1080p Hi10p MKV. 720p used around 40-50% while MPlayerX used round 90-100% (this is on my MacBook Air 2010).

What MPlayer needs it's to migrate all these fixes done by Hermi to the original fork at github, and after that, move it to the Mac App Store.

Best video player ever. It has full support for GPU acceleration, excellent playback with MKV (subs inclusive) and friendly user interface. After trying VLC, Lunnetes, QuickTime, Movist, I have finally found my best app!