Lion upgrade on early 2009 MacBook (2GB RAM, 2.0GHz Intel Core 2 Duo)
I have a late 2008 MacBook Pro 5,1 2GbRam 2.4GHz When I updated to Lion, I had no major problems. I had always planned to upgrade my Ram so after one month I did 8GB When Apple said my MBP can only take 4GB. 8Gb of RAM cost $40 on Amazon, best investment I made this year.