iWisoft Free Video Converter is a free multi-format video converter. It has quite good format support and an interface that is similar to many other converters out there, but it still manages to be easy to use and intuitive. It uses conversion profiles to make the process easier and to help the user decide what format works best for the task at hand.
First, performance-wise, the converter is excellent. It supports most formats that you would expect it to and the use of conversion profiles is one of the best I have seen. I like the fact that the profiles are all arranged and when you select a category or device, you can choose from more specific profiles. Also, you can customize those profiles by changing individual settings like frame rate, resolution, among others. The fact that you can drag and drop files and even apply settings to more than one queue file at a time is also of my liking .
I don't really know if the user interface is original to iWisoft, but I have seen MANY converters use it. I am not saying it doesn't work. I believe it really does. It is intuitive and has on-screen help. It would help developers to create original interfaces so their products are easily remembered.
All in all, this is a free converter that works extremely well and has many useful features and excellent format support.