As its name suggests, iW3 ($200) is iHome’s third wireless speaker with AirPlay support, arriving one year after the iconic iW1 and several months after its better, less expensive sibling iW2. Shown together for the first time way back in early 2011, all three of these systems look basically the same—black fabric and plastic all-in-one units with chrome bases—but differ in sizes, shapes, and/or features. The extruded pill-shaped…