OK, I'm thinking of upgrading my 15" MBP with the Data Doubler from OWC, and I have some questions: 1. I've heard that there is an issue with having a HDD in the optical bay vs an SSD; is that true? I really don't want to fork out the money for an SSD if I don't have to. 2. I was going to get the Western Digital Scorpio Blue 1TB HDD and use that in the HDD bay, and put a Seagate Momentus 750GB HDD in the optical bay, but now I wonder whether that's a good idea. I just heard about the Samsung Spinpoint M8 1TB, which is 9.5mm versus 12.5mm for the WD. How about putting that in the optical bay and put the Momentus in the HDD bay? Any and all help that I can get in this matter is greatly appreciated. Thanks!