Free CUDA Video Converter
Full user review
"User interface looks nice. Didn't work."
The GUI is quite attractive and looks like a comprehensive program. I guess it's worth mentioning that upon installation, the program said it recognized my CUDA-capable NVIDIA graphics card, and would include that in the configuration.
A bit non-intuitive. The help file is almost non-existent and everything I did popped up annoying ads touting the paid version's extra stuff. The first thing I tried was merging two .mov files. It failed. I shall uninstall it.
Not worth the trouble. Others may find it more useful, but I can't recommend it.