...because this thing freaking flies on my 2011 MBP (see sig) Startup is about twice as fast as on SL - I basically go from the initial Apple logo to the login screen in about 4 seconds. If I type in my pwd fast I'm in and everything launched in about 2-3 seconds. I have things opening on different spaces so my desktop flies between spaces like it's lost it's mind until it settles. Quite amusing to watch. Once in, it's very very fast in terms of UI and animations, etc. Launching apps is faster, scrolling is faster/smoother, everything works great. Now I know that on this type of hardware it better fly but just wanted to say that I definitely notice a difference in performance between SL and Lion. Maybe on the newer hardware SL was holding it back a bit...either way I'm happy. Now I just need my damn NAS to work with TM and I'm set.