So I just finished installing SL. The installation went very smoothly, no issues. I have been playing with it for a while and have a few impressions : 1. It feels a tad slower; though for a first day release that is to be expected 2. The larger icons and Finder is cool; if you have cover art for media it shows up 3. CHECK YOUR APPS!; while most apps will work, how well it works will vary (firefox is a tad slower for example) 4. Overall, I like it so far but it will have growing pains and we all must be patient.