Works like a charm; unobtrusive, yet always present. It helps me keep to British English and stay clear of the American English dialect. It works equally well with my native language. But there is one flaw; my native language is Norwegian, and it's quite similar to Danish and Swedish - and this add-on rediscovers what language I'm writing all the time, getting it wrong pretty much 2/3 of the time. It's easy to correct, but it would be good to make it "stick" to Norwegian, and let me choose the other language for the rare occasions I actually use it.