The unanticipated popularity of the LC 520 prompted Apple to develop two speedier sequels (the LC 550 and LC 575). In February 1993, these one-piece Macs made their debut -- their only differences being in found in processor speed. Apple ensured widespread access to these models by selling them as Performa Macs in consumer electronic stores nationwide! Current used market value of a 4/160/cd configuration: $570