I've only been playing around with it for a few minutes, but I like the features thus far.
There is a problem with the display of the error message text on the registration form. WordPress 3.8 uses a
wpmem_msg class on the div wrapping the message, and this force line height to zero, causing problems with any messages containing line breaks. This should be easy to fix.
This was fixed by changing the "Stylesheet" option to the option for the "Twenty Thirteen" theme.