polymer-experiments
                                
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                        Accessibility Please
Keyboard and screen reader support is lacking I guess - I didn't try or look, but Marcy says so, so I believe it :)
https://twitter.com/marcysutton/status/537310830128160768
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The keyboard experience isn't equal. On the native element, the select menu opens when you tab onto it and use the arrow keys. On the Polymer version, arrow keys simply change the value but don't "open" the menu. 
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There are no semantics on the custom select--it needs ARIA roles and states to communicate what the thing does to assistive technologies. See this multiselectable example from James Craig: http://cookiecrook.com/test/aria/multiselect/listbox.html And the listboxdocumentation on MDN: https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/ARIA_Techniques/Using_the_listbox_role