Both the very good "Outline Object" plugins (BoltBait's and pyrochild's) round the corners on the outline.  In most cases, this isn't a big deal, but sometimes I want the sharp corners.   In the uploaded image, the left star has BoltBait's Outline Object (v4.2) applied twice with default settings, while the right star is created using the built-in star shape three times, each one slightly larger than the last.  Notice how sharp the corners are compared to the outlined version?