My real-world tests suggest that Fuji are on to something. The image detail from their SuperCCD cameras does tend to be better than I would expect from a camera of the actual optical resolution of their models, though not by as much as Fuji claim. Fuji tend to double the optical resolution to give their effective resolution, so a 3MP optical resolution ends up as a 6MP effective. Personally, I'd say it's more like 50% improvement. A Fuji 3MP optical resolution equates to more like 4.5MP (maybe 5MP) from a camera using the conventional rectangular pattern.