Personally, I found that writing has definitely become easier ever since I started using Linguix. I am much more efficient and I sound more professional. I highly recommend it to people who are not as confident with their writing like me.
The only error I noticed was that sometimes the verbs are highlighted red even when there is no grammatical issue. It seems like the system doesn't catch on fast enough to some variations of verbs. As a result the wrong suggestions appear. Maybe that could be something to work on?