As of Wednesday morning, Plains GP Holdings (PAGP -0.26%) is officially on the table for investors. It is the 15th master limited partnership to debut this year, but it is a little bit different than what we've seen so far. In this video, Fool.com contributor Aimee Duffy looks at Plains GP's IPO stats, exactly how this holding company fits into the Plains All American Pipeline story, what the partnership plans to do with its IPO proceeds, and what investors need to think about before they buy in.