Hi everybody. I have a 2009(mid year) Macbook Pro. 2.26ghz 4gb of ram 7200rpm hd 320gb I'm planning on making to jump to mountain lion from lion. Have any of you done so yet? If so, please share stories of your upgrade or benchmarks? Do you feel that there was a speed improvement? btw. I've had more heating problems with Lion than Snow Leopard. Is it true for Mountain Lion as well? Thanks in advance.