.....but did it onto a 64GB USB drive. Installation went smoothly and didn't seem to cause any issues with my existing Mavericks install so all good. There's a few lags, but I'd expect that running from a USB so not overly concerned. First impressions? Seems ok. Running quite smoothly, although Spotlght is a bit funky and is only giving local search results. I don't know if that's because the web search component is only available in the US right now or the fact the SpotlightNetHelper (I thnk I remembered that right) is permanently listed as 'Not Responding' in activity monitor. As are SafariNotifications and com.apple.geod The appearance is a little teletubby but I think that's just because it's new rather than it's just nasty. Although, like quite a few others, I do think the new blue folders are just a bit too much. I created a new apple/iCloud ID as the install finished so I wasn't tempted to convert my existing account to iCloud drive. Should give me some idea of how stuff works without messing up my current system. Overall I think I like it, but with a couple of reservations. Mainly the blue folders, and the Safari address bar only showing the main domain a la iOS. I really don't like that on iOS and I'm a bit disappointed it's come to the Mac.