"So Good" was certified silver on 19 August 1988, gold on 8 September 1988 and platinum on 14 February 1989 by the British Phonographic Industry (BPI).In the US, "So Good" peaked at number eighty-six on the "Billboard" 200, accumulating a total of twenty-three weeks on the chart but found greater success on the Top R&B/Hip-Hop Albums chart, peaking at twenty-nine and accumulating a total of twenty-four weeks on the chart.