自動雙面掃瞄/自動單面掃瞄

For家用,呢啲function會唔會好易壞?我見有啲機 (如Epson Workforce WF-2651)唔洗過千已有呢啲function,但得果一年保用,怕買咗返屋企最終玩死自己。多謝指點!