I am sure there are more important things in it, but seeing that it is a FREE new version of windows and not a service pack i would get it.
I went from feeling a little out of place in Windows 8 to feeling that the whole OS for 8.1 finally fell together and i am so happy with it, and this is coming from someone who hated the start screen but now never use it apart from an apps menu which looks great.
http://www.itpro.co.uk/mobile/20091/...op-10-upgrades