Unless you're interested in Metro (nobody), is there anything remotely interesting about 8.1? Mavericks has some impressive battery and performance improvement

Unless you're interested in Metro (nobody), is there anything remotely interesting about 8.1? Mavericks has some impressive battery and performance improvements that anyone will be able to use. I'd be mad if I had to pay for 8.1. I would've happily paid for Mavericks.