Thus far I really like it. I chose the option to upgrade (automatically) and everything is running great. I had just formatted and did a fresh install of Snow Leopard so, I really didn't have anything to lose if I did lose anything. I haven't noticed that I lost anything yet. The only thing that does bother me right now and I think many others have complained about it is, the three finger swipe to go "Back" in the browser. Now it switches through the desktops instead. :| VMWare 3,x works great. That's about the only piece of software that I was really worried about. Need it to run Windows for Packet Tracer. Currently studying for my CCNA. Just another appreciation post to Apple. Thanks.