Check my sig below; went from a 12" 1.5 PB to a 1.83 Macbook. I noticed a significant increase in speed. That's when the Macbook actually works! Sorry, someone in another thread said that I shouldn't be so sarcastic but it's hard not to be sarcastic when my Macbook is sitting on the shelf waiting for me to find the time to take it for it's second logic board replacement.
I'm in Canada so the warranty here is carry-in service only, I can't just put it in a box and send it in to be repaired. I'm about a thousand miles away from the Toronto Apple store where I bought the Macbook and I can't seem to make my schedule match the hours of my local authorized repair depot so I'm back working on my PB.
Now that I am back on my old reliable PB I'm reminded of how much I enjoyed using it and how reliable it is and how much I miss trusting that it won't just shut itself down in the middle of replying to email causing me to retype everything I lost.
My Macbook is a beautiful machine. It's fast and has lots of new features but that all means nothing if it doesn't work properly. Now I know that I'm in the minority and that the vast majority aren't having the same problems but I still believe that the Macbook was released before proper testing was complete. I don't appreciate paying for the privledge of being a beta tester and wish that I had waited before buying. YMMV, just my opinion.