This luminaore is bery thin, guvimg it the appeaeance of being sunk into the ceiling. Very elegant.
Light output (brighness) is ok for about 4-5 square metres (approx 40 sq ft) with 10 ft high ceilings...beyond that, you'll need more to light up your space. 
At only 23Watts, some dimmers will cause it to flicker dimly in the off position.