When the unit arrived, I was initially very surprised by the dimensions of the device, but we must not forget just that this is one device for all filter or lens sizes up to 77mm Nikon and therefore naturally has to cover a wide range and therefore is also quite large.
However, and this brings me to the only small minus point, attaching the threaded adapter is indeed no problem, however, with some lenses in large zoom levels, part of the field of view is obscured by the ring flash.
Otherwise, the operation is simple, everything can be set in the display at Battery Pack (brightness and intensity of LEDs, control of the LEDs (left, right, complete)), the power supply is running on four AA batteries, keeps longer than average to thank the LED technique and complete illumination of the ring flash that can also be easily used in dark rooms for normal shooting.
Conclusion: All in all for the price a compelling device, especially for beginners and people who want the macro photography only to try, ideally suited. Professionals will probably evaluate the slightly wobbly adapter rings is not positive, but I find it more than adequate!