Right the new OS is almost here and I'm in two minds what to do! Since I upgraded my iPad 4 and iPhone 5 to iOS8 I've regretted it ever since, and the icing on the cake I also upgraded to iCloud Drive - losing the sync between Pages, Numbers and Keynote on Mac and iPad! My usage - - iPhoto for personal pics 7,000. - Aperture 25,000 pictures, from work photography. - Photoshop CS6, Illustrator CS6, iBooks Creator, some web development. - Parallels with Windows 7 running Revit 2014, medium models and some 3DS max. Also some other VM's for analysis software, nothing intensive more legacy windows apps. I've got a 15 Retina Macbook Pro 2012 2.3 ghz, 256 GB SSD, 8GB Ram - How will it faire on Yosemite? Concerns - - No more iPhoto or Aperture so are the apps 'broken' on Yosemite, and/or are there options to run them? - RAM, is the OS a RAM hog? - Upgrading for the sake of upgrading, in hindsight that's what I did on the iPad and iPhone and in all honesty I was happy with iOS7! Worth the bother? Appreciate anyone who replies, I wish I had a spare machine to test Yosemite myself - unless it's possible to run Yosemite from a USB hard drive?