I bought the Snow Leopard upgrade for $39 and when I tried to install it, my computer crashed, something I never experienced before. Took it to Apple Store, they backed up all my info on a back-up drive and and installed Snow Leopard for me. I was only charged with the cost of purchasing back-up drive. However, I'm starting to believe I was better off without Snow Leopard. IPhoto constantly locks up and my computer is much slower than before. I wish I had left well enough alone and just held out for another year or two until I could purchase a new MacBook. Anyone else have a negative experience with the Snow Leopard upgrade?