As with Maverick, the installer is clean, polished and easy, and continues the trend of asking most of the configuration questions once the actual installation process has started to save time. You also have the opportunity to install third party programs, such as Fluendo's MP3 codec, at the time of installation, which is nice.
At this point, I don't think they've switched over to the proposed Unity interface by default, so I can't say whether I'll have a better experience with it now than I did on my netbook a few months back, but I'll update this post with more information as soon as I have it.
As for its performance in a VM environment, everything is stable and the VBox Guest Additions installed just fine, imparting mouse pointer integration and support for arbitrary resolutions. The only thing lacking is 3D acceleration within the VM, but I assume this will be supported at a later date.
Overall, the experience is not significantly different from that of 10.10 Maverick so far, but I expect things to change rapidly in the near future. I'll keep this post updated with any changes I find.