Hello everyone! I have a late 2009 MacBook with the 2.26 Core 2 Duo and 4GB of RAM that i'm looking to upgrade. I guess my questions are: 1) Is having more than 4GB RAM useful? 2) Is an SSD really worth the time and money? 3) Is having mixed RAM okay? (I.E. 2GB original stick and 4GB Crucial, same PC3-8500 spec) Thank you! I hope some of you have experience in this.