Did some tests and seems all the HTML5 tags / features work pretty well across all modern browsers except in IE6 for whom you have to use a little JS to make it style specific HTML5 elements.
It's easy but still takes quite some time to shape your skills / remember all the tags, etc.. I think I will not adopt it so soon in any foreseeable future as I have yet to discover any substantial benefits it offers.
It's disrupting.