It flagged 'jacket', a noun in that sentence, as a verb and wanted me to make it agree with the noun.

It is dog slow.

It makes changes that you can't see until you go back and look at your original text. Has a really hard time with a selection if you make changes on the fly as the checker checks.

You can't 'go back' or 'undo'.

You can't edit right into the text field without the beach ball of death spinning into a crash.

Doesn't play well with latest mac:Word.

It flagged enough stuff that I wanted it to that I was very disappointed with its bugs, its slowness and the fact that it flagged words like 'The' at the beginning of a sentence and wanted me to make it agree with other parts of the sentence.