I dive it when I go deep but thats the only type of scuba I do. When I dive shallow I am always free diving. From the buddies I have talked to most of them have said the just "feel better" when they dive nitrox, even in shallow dives. This is in reference to a slight discomfort that some people get when diving to depth, usually just after 10m. Seems to be remedied a bit on those that are a bit excessively sensitive to the pressure changes.