I use Ozone on my 240
Feed straight into my skimmer intakes and out over carbon as with most people.
When i started using it earlier in the year, i noticed a massive improvement in water clarity, and it has helped with a reduction of algae in the tank, which could be down to a number of factors, but i only really started to notice a substantial drop after adding the Ozonizer.
I don't run it hard, some people seem to like to run ORP at about 400 to 450 from what i vaguely remember (please correct me if i'm wrong), i keep mine at about 250, everything is doing well, no ozone smell anywhere.
I still do regular 10% water changes every week.
I have the Red Sea Aquazone 200
HTH
Anton