Mostly decent, but British English is not listed as a mother tongue or preferred language, so I was constantly get 'corrections' from British English to American.
I CANNOT have English 'no variant' as ONLY option shows US flag for both mother tongue and preferred language. The only place where English British is available is variants which doesn't seem to ever come into play when I was using this as it only ever flagged up British spellings wanting to change them to American.
I'd post screenshots but i cant seem to be able to.