Aiseesoft iPhone 4S Video Converter for Mac is a commercial video converter. It can be used to convert video files to formats that are supported by the new iPhone 4S. Some things have changed in the new iPhone, but format support isn't one of them. This video converter, just like Aiseesoft iPhone Video Converter for Mac, can convert files into several formats, including H.264, MPEG-4, MOV, M4V and a few more. There are quite a few conversion profiles available. They are all very similar with the exception that among the iPhone 4S profiles there is one that uses a resolution of 1080p, while the highest definition profile for the iPhone 4 uses 720p. As you may know, the iPhone 4S has better processors, so you can benefit from the 1080p profile if what you want to do is use the TV out feature.
The graphical user interface is neat and very simple. I like the color scheme and the layout. There is a video editor and a video player, and all the conversion profiles are sorted into groups inside a drop-down menu.
In terms of performance, I can't really complain about this app. I always test with an MKV file, and this converter opened it and converted it without any problems.