The way I understand it, the new fusion drive uses PCI E just like the SSD option. Which means the 128 GB hard drive in the Fusion Drive should run at the same speed as any other SSD that you can buy. But let's just say I'm wrong and you can scratch all of that. Mostly I just want to know how many actual megabytes per second I will gain by purchasing the much more expensive 1 TB SSD? If we're talking 722/s vs 863/s I don't think it's worth it. I'm also curious to know if the 3 TB fusion drive is any slower than the 1 TB fusion drive? Thanks so much!