This is nice. Curious, have you checked SEO which is crucial for many e-commerce sites given the JavaScript dependency? <a href="https://moz.com/blog/javascript-seo" rel="nofollow">https://moz.com/blog/javascript-seo</a>
Search floats oddly on page. Would not expect the top nav to be a category picker. Sorting doesn't seem to work. My whole screen flashes when I move from "Save" to price. I don't really care for the spinning triangle on every page view.