What problems have you run to thus far and how long have you been using it? So far Ive been running it for a week and have found a couple: 1. Utorrent beta stopped working. 2. Converting to 32 bit popup when in preferences menu 3. I cannot drag files from my download folder in the dock directly to the trash bin. Other than that I love it, I really do feel it runs much smoother and I get longer battery life out of my Macbook. What little differences have you noticed that you liked too?