I've got a 512GB SSD in my MacBook Pro right now. I could use some more space... Dual SSDs is out of price range. Considering getting dual Momentus XT 750s in Raid 0. I use Time Capsule + Crashplan for backup so i'm not worried about 2x the chance of failure. Has anyone removed their optical drive an popped two of these guys in? I'm thinking that in Raid 0, their performance must get pretty close to SSD level, perhaps better in some cases, but likely not better in most (depends on use-cases).