Altra Zero Drop has just launched the next version of their best selling models: Instinct 1.5 and Intuition 1.5. Following that release will be The Superior in October and The 3-Sum & The One by the end of 2012. [jbox color=”yellow” icon=”http://weartested.org/images/on-sale.png” title=”Altra Instinct & Altra Intuition 25% OFF Sale”] With this launch the original Altra…