The simplicity of the GUI that they have is by far the simplest I have used with any storage vendor. I have used HP, NetApp, Dell, and others and Pure Storage surpasses them all by a long shot.
When it comes to upgrades or maintenance, the Pure Storage team does them for you with NO DOWNTIME! It does not get any easier than that! Just send them an email with the date and time and you can sit back and relax!