I wasn't expecting that to be honest. I just got the new MBP today (15" 2.3GHz i7, Lion) and simply installed my SSD taken from the old 15", a couple of generations old, Core 2 Duo in it. Powered up and ... everything works. Absolutely everything, most software don't even require reinputing the serials. To be sure I did re-run the 10.6.8 update to clean up all the drivers and removed all my cashes. It's completely flawless and as fast as before.