Tried the free trial version and liked the output quality so I upgraded to the pro version, use it all the time for converting video file formats to mp4 to play on my ASUS Transformer and the quality is out-standing, if you know what you're doing in the settings parameters the result is amazingly clear.
Optimized for nVidia Cuda which is also a bonus for me when encoding h264, taking advantage of your GPU power the processing is extremely quick.
Converts without fail to every format container.
Would've given it 10 stars if it supported 5.1/7.1 channel audio output.
@Gteamin, read the info before you download FREE software, its a TRIAL VERSION so of course its FREE.
Best:
Clean GUI
Great quality output
Fast conversion [depending on your PC's processing power]
Worst:
Only supports 2 channel audio output
Needs 5.1/7.1 multichannel audio output option