After seeing so many threads filled with endless justification on one side and pure vitriol on the other, I wanted to give my thoughts. First, what I am missing from Lion now that I am back to Snow Leopard: iCal: In the run up to Lion's release I was so skeptical of iCal, but now I can see that from a UI standpoint Lion's iCal is leagues ahead of SL. I never thought I would say it, but I miss the faux leather. Mail: One of the headline app changes in Lion and for good reason. However, since it still doesn't not play nicely (seamlessly) with Gmail I do not miss it too much. Quicklook: Lion has perfected Quicklook. Resizable windows on the fly. Stays open in the background. Button to open in App. It's... perfect. More refined Finder: I'll miss having the actual "Kind" categories displayed in Column View for sure. It's a small, but useful feature in Lion. And now, here are the things that drove me away from Lion: Unstable OS: It was this in a nutshell. When I wake from sleep and have to perform gymnastics to get my wireless connection back (even when the network diagnostics says everything is good), then there is a problem. Last week it went past the tipping point when my screen would regularly not wake from sleep for a few minutes. System Performance, Memory Leaks: Chalk it up to whatever metric you can cite, Snow Leopard is just a faster, more stable OS. Coming back and using it after two months of Lion makes this incredibly apparent. Incomplete implementation of new features: The gestures in Lion are just flawed. There are bonafied conflicts when you play with the scrolling directions and the forward and back gestures. The same can be said with full-screen app implementation. All in all, I'm happy that I can return to a stable Snow Leopard OS. I just hope Lion can mature nicely in the next few months so I can come back to it, because some of the features are really compelling.