Ok, so I've been using the UK version for about a month and didn't want to stick my thoughts on here until I'd really given Cortana a run for her money.... What I don't get is the US version understood me at least 95% of the time. The UK version is getting my accent about 60-70% of the time, meaning I'm a LOT less likely to try and show off Cortana in public these days for fear of looking like a complete arse. And almost every question results in a plain bing search. And the voice.....WTF.....why would they ditch a perfectly good voice?! In a nutshell, its miles and miles away from being as good as the US version.