Not much difference in price over the BD570, but this has 3D playback and also still able to play MKV's by inbuilt wireless connection or external HDD formatted to NTFS so +4 gb no problems. Only file I can't play on my LG is ISO's
3D Blu-ray Blu-ray BD-Live Wi-Fi and DLNA YouTube from LG Netcast Picasa from LG NetcastAccuWeather from LG NetcastMusic ID powered by Gracenotes1080P upscaling
Thanks to the latest software and HDMI 1.4 socket, the LG BX580 is able to playback 3D Blu-ray in full High Definition. Link to a 3D TV and home cinema receiver and you'll enjoy the truly remarkable, enveloping picture quality that 3D brings.
3D TV aside, this is an impressive Blu-ray player. With a 12-bit video DAC and Video Enhancement system, not to mention 1080p upscaling for your DVDs, the BX580 produces the kind of crisp detail and smooth motion that LG have become renowned for of late. The sound quality is powerful, dynamic and, like the picture quality, detailed, too.
With its standard Wi-Fi connection, the BX580 can be connected to your home network hub without the need for cables. From here you can stream content via DLNA or access LG NetCast. LG NetCast lets you browse selected sites such as YouTube, Picasa and Accu weather. A further advantage of the wireless connection is being able to access BD-Live features. BD Live lets you stream or download additional film material via the Internet. An unusual feature but great to have is the Music ID powered by Gracenote. Hit the Music ID button when playing a Blu-ray, DVD or CD and Gracenote will search the database to identify the title, artist and album.