Head and shoulders above every other optimisation plugin I've ever used...and I've tried lots of them! Both the free and premium plugins give users a remarkably clear and user-friendly way of improving site speed. The page speed tests are insightful and offer suggestions which are easily actionable through the plugin. The support I received from WPMU was also second to none. Every chatbox I opened was connected to an adviser within seconds and they were always able to find solutions within a matter of minutes. I hope more plugin developers follow your lead!