Add silent and cool operation and it's by far the best upgrade I've ever done!
Agreed. My laptop runs so cool that the fan hardly ever turns on.

I laptop already boots in about 20 second on Karmic so it will be very exciting to see how fast Lucid goes.

I ran Karmic from the first alpha and had few problem (except with the change to the new version of GRUB) till I got to the betas. Then lots of things starting going wrong, I was getting maybe 5 crashes a day from various programs.