I am using it as I write this! So far I am pretty impressed with it. There were no problems installing it, and running it was a breeze. It didn't require any additional hardware and so far my experience is great.
I really like the new 'tablet' feel and think they may have hit a home run with this one!
IE10 is really quick and performs excellently - so far I have not had problems.
It is effectively a 'beta' version so there is still much work to be done - for example the app for email has no pop3 support.
So far it's great - I am using it on my 'spare' Laptop and look forward to seeing a full commercial version some time this year.