I recently updated my Snow Leopard OS to Mountain Lion, I never updated to Lion as I didn't see the need at the time. With the new features (Safari and Airplay mirroring as an example) and the low price of Mountain Lion I thought I would give it a shot. I won't touch on how i feel about the new features coming from Snow Leopard as we have a lot of threads already covering most topics but before I updated I had installed an OWC 240 SSD with a clean install of Snow with all my normal Applications. I ran a Time Machine backup for a good restore point and Lion update once i had verified all my critical applications were running prior to the update. One thing i did was run Nova Bench to grab a base as a way to see if Lion was more efficient or maybe had updated drivers for our Macs. Below you can see the results before and after the update. Lion seems to be a little more efficient with Graphics, CPU and drive write speeds, though I don't understand why for the later. I thought I would pass it along for those who were wondering if they wanted to update to Lion from Snow. Personally I like it and seems pretty smooth sailing so far. Sorry if this has been discussed prior, maybe we had the same results from Snow to Lion vs Snow to MLion.