Rated 4 out of 5 stars

I use this occasionally to transliterate blocks of text, and it's very useful.

For better or for worse, it's also geared towards native Cyrillic users in that it uses the F2 key, and it's happened to me that I've pressed that accidentally over the location bar and gotten rather confused when I couldn't "escape" from it (until I stumbled upon the fine manual). Other than that bit of nuisance it's fine.