Against an average not awful opp. i will play SCs if we both have 20x but i will only play them IP. i never limp SCs and will only raise them in LP or call a raise IP. Seems to be working out as slightly profitable for me but i've only recently started incorporating them into my game. Against someone who i feel i can read fairly well (i.e. will fold to semi-bluffs/can't fold TPTK), i may call with less than 20x but again only with position.