The app is very good i was able to compress an one hour 2 GB mov to 254 mb MP4 file which can help in storage without losing a lot of quality, then i went to compressor it was able to compress the same file to 60 mb by adjusting the size.
Thing to consider:
-The app speed is ok it will take around 30 min for one hour video.
-The activation is for one computer only you can not change it later.
-You need to activate it with the internet but during activation i had an error that i have a network problem it was solved by disabling the firewall in windows (Malwarebytes).

I general it can help in converting file to other format and decreasing file size with minimum decrease in quality and good speed