Best looking OS X converter imo. And most important it does everything very well indeed.
I am not a video enthousiast but need to convert ones in a while a file or two to my iPod Touch.
All files I converted are of a very good quality without changing anything.
To be honest, I did not dig into this very deep but it seems to have a lot of options to go for. I only use the iPhone preset.

The developer is also very responsive to my requests. Always good to know imo