Agreed that there is a lot of improvement hidden under the hood. However, much is made of the apps - iMaps and iBooks, which I don't use, better synching with mobile devices, which I don't use, improved Safari - I still think SWR Iron is better, and Finder improvements, which I don't use. As Mixture will tell you, I'm a bit of a dead loss really because I simply don't use the machine in a broad enough way to encompass all these improvements. The only real difference I've noticed is that browsing is much quicker and I put that down to the excellent SWR Iron. Sorry chaps . . . !