Has anyone installed a SSD/HDD hybrid into their MBP? OWC sells a Data Doubler with120GB OWC Mercury Extreme Pro SSD and 5 piece toolkit. This gives you a 120 SSD, and you move your internal HDD to the optical drive space. It costs $280. How does this work for people? Is it as fast as a MBA SSD? Any potential problems with OS 10.7? Thanks!