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i used this extra lens on a sealife dc600 on 15 dives in bonaire. it does help extend focused depth of field in photos and allows you to get closer to fish/coral/etc to get good details and still fit the main object in the photo. there was occasional darkened areas in the corners of some photos, but they were easily cropped out of the photos. it also gives interesting results on photos taken above water almost circular frame with fish-eye effect.
used this belt on 15 dives in bonaire found it to be very comfortable and easy to adjust. i ran it through washer and dryer before using as it starts out being very stiff and inflexable it does become more flexable as you use it.