I currently own a 2011 15" MacBook Pro 2.3GHz Quad-Core Intel i7, 16GB Corsair Vengeance 1600MHz, 480GB OWC Mercury Extreme Pro 6G. I have an OWC Data Doubler, 256GB Samsung 830 SSD, 512GB Samsung 830 SSD, and 750GB WD Scorpio Black 7200RPM sitting on the shelf. Ideally, I would like to have the 256GB Samsung 830 as my OSX drive and symbolic link movies and pictures directories to the 512GB Samsung 830 in the optical bay via OWC Data Doubler. Have the recent firmware updates made SATA III 6.0Gbps SSDs stable in the optical bay? Otherwise, the 480GB OWC Mercury Extreme Pro 6G with stay in the main drive bay and the 750GB WD Scorpio Black 7200RPM will go in the optical bay with the OWC Data Doubler. Why? I prefer slightly less but much faster and silent storage over the noisy power hungry mechanical drive.