The screenshots make this look like a great plugin! WordPress definitely needs more competition and innovation in the translation plugins.

I'm disappointed to seeing these plugins continue using flags to represent languages when that doesn't work for so many reasons:

1. People speak the same language in different countries.
2. Many flags are the language of the former colonial oppressor.
3. Flags ignores differing dialects (e.g. British English/American English).

This is an old and well-known issue. It's so common that it's the name of a blog! http://flagsarenotlanguages.com/blog/why-flags-do-not-represent-language/